Machine roomless lift system having a drive on the lift car

Abstract

The invention relates to a machine roomless lift system having a drive on the lift car, and having: • a lift car which is guided in car guide rails, the car guide rails being located on one side of the lift car; • at least one counterweight which is located on the same side of the lift car as the car guide rails; • a drive system which comprises a flexible drive and is formed at least from: at least one drive motor having a drive element, at least one output shaft which is not integrated into the drive motor, and at least one transmission means, these components being mounted under the lift car and the output shaft being driven by the drive motor; and • one or more suspension means which connect the lift car to the counterweight, the suspension means on the side of the lift car on which the counterweight is located being run in two suspension means strands, coming from above, under the lift car and via the output shaft, and • the distance between the suspension means strands which extend from above to the lift car corresponds at least to the width of the at least one counterweight.

Description

[0001] Machine room-less elevator system with drive on the elevator car

[0002] The present invention relates to a machine room-less elevator system with drive on the elevator car.

[0003] In machine room-less elevator systems, a distinction is made between systems with a moving drive attached to the elevator car and systems with a stationary drive mounted in the elevator shaft.

[0004] In most machine-room-less elevator systems with a drive mounted in the elevator shaft, the drive is positioned at the top of the elevator shaft. One embodiment of such a state-of-the-art, very commonly used machine-room-less elevator system is shown in Fig. 7 (not part of the invention). The elevator car is suspended on 2:1 pulleys, with the pulleys arranged as centrally as possible to reduce the forces acting in the guide rails and achieve better ride behavior. The 2:1 suspension of the car and counterweight reduces the torque requirements on the drive by a factor of 2. The car guide rails are also usually arranged as centrally as possible on two sides of the car.This guide rail arrangement requires a lot of space in the elevator shaft, as the guide rail is located between the elevator car and the counterweight on one side, and between the elevator car and the shaft wall on the other. In addition, there are guide rail holders on both sides. Positioning the drive at the top of the elevator shaft also has disadvantages. If the shaft headroom is low, more space is required in the shaft width because the drive is located between the elevator car and the shaft wall when the elevator car enters the top floor. If the shaft width is reduced while the car width remains the same, a larger shaft headroom is required because the drive and / or drive frame are located in the profile of the elevator car.

[0005] CONFIRMATION COPY It is therefore not possible with this elevator system to reduce the space requirements horizontally and vertically to a minimum at the same time.

[0006] Another machine-room-less elevator system with a drive mounted in the elevator shaft is described in DE 10 2006 005 948 A1. Here, the guide rails are arranged on one side of the elevator car, saving space in the required width of the elevator shaft. The deflection pulleys mounted between the elevator car and the counterweight require additional width. In this example, the elevator car and counterweight are also suspended at a 2:1 ratio, which also reduces the torque requirements on the drive by a factor of 2.

[0007] In the document EP 0 905 081 A2, for example, Figures 16-20 show a machine room-less elevator system with a drive stationary in the elevator shaft, in which the elevator car and the counterweight are suspended 1:1 and suspension elements are arranged at both ends of the drive. Due to the 1:1 suspension of the elevator car and the counterweight, the torque requirements of the drive are very high and a large drive is needed. In addition, with this arrangement of the suspension elements at both ends of the drive, it is very complex and expensive to integrate the required brake and the required absolute encoder into the drive. In most drives, the suspension elements are arranged at one end and the brake and the absolute encoder at the other end, which reduces the effort and costs.

[0008] A disadvantage of elevator systems with a drive mounted stationary in the elevator shaft is that the elevator control system must be located near the elevator shaft and the necessary space must be planned for this.

[0009] In elevator systems with a drive on the elevator car, the entire control system can be mounted on the elevator car. Located outside the elevator shaft, very few parts are required for service personnel to operate the elevator system. This simplifies planning. Furthermore, there is less noise in the rooms adjacent to the elevator shaft during operation because the drive is located on the elevator car and not directly next to a shaft wall. An additional advantage is that time is saved during electrical installation, as all components are located on the elevator car, thus shortening installation routes. Components such as the load scale and a traveling speed governor can also be mounted on the elevator car.

[0010] Document EP 1 305 249 B1 describes a machine-room-less elevator system with a drive mounted on the elevator car. Various solutions regarding the arrangement of the guide rails and the counterweight are described. Here, too, the elevator car and counterweight are suspended in a 2:1 ratio, just like in two previously mentioned elevator systems with a stationary drive mounted in the elevator shaft. The difference is that in this elevator system with a drive mounted on the car, the 2:1 suspension does not reduce the torque requirements of the drive, which is a disadvantage in terms of the size and weight of the drive.

[0011] The publication DE 600 31 313 T2 describes a machine-room-less elevator system with a drive mounted on the elevator car, with the rotation axis aligned vertically. In this example, the elevator car and counterweight are suspended at a 2:1 ratio, and the torque requirements for the drive are very high. Furthermore, the elevator car's guidance on two sides and the counterweight's location on the rear wall of the car adversely affect shaft utilization.

[0012] The aim of the invention is to develop an elevator system that is as compact as possible and requires as little space as possible in the elevator shaft, both horizontally and vertically, in order to achieve the most efficient use of shaft space. Furthermore, a suspension system that offers excellent ride quality is to be achieved. These goals are to be achieved with a drive system that features a simply designed drive motor and in which the torque requirements on the drive motor are as low as possible and can be reduced through simple measures.

[0013] According to the invention, the object is achieved by a machine room-less elevator system according to the features of claim 1. Advantageous embodiments of the method are specified in the subclaims.

[0014] The machine room-less elevator system with a drive on the elevator car consists of an elevator car guided on one side in guide rails. At least one counterweight is also arranged on the same side of the car guide rails. One or more support elements connect the elevator car and the counterweight and are moved by transmitting a force from the drive system. According to the invention, the drive system has a traction mechanism drive (e.g. belt drive or chain drive) and is formed at least from: at least one drive motor with a drive body (e.g. drive sheave or drive shaft), at least one output shaft not integrated into the drive motor, and at least one transmission means (e.g. toothed belt, V-belt, V-ribbed belt, flat belt, round belt, chain), whereby these components are mounted beneath the elevator car. The transmission means is preferably closed and connects the drive body on the drive and the output shaft.The drive motor and the transmission means interact and drive the output shaft by transmitting a force, and support means that connect the elevator car and the counterweight on the side of the elevator car on which the counterweight is located are guided in two support means strands coming from above under the elevator car and over the output shaft, and the distance between the two support means strands running from above towards the car on the side of the counterweight corresponds to at least the width of the counterweight, with no support means between the elevator car and the counterweight, and the two sections of the two support means strands running under the elevator car are not connected to each other (not connected to each other does not refer to the lateral distance between the support means strands, but rather that the support means of the two strands are not axially connected to each other).In the preferred embodiment, the two suspension elements run parallel to each other beneath the car from the counterweight side to the side of the car facing away from the counterweight, and then run upwards again on the side of the car facing away from the counterweight. This allows for both a central arrangement of the drive on the elevator car and a central suspension of the elevator car in two suspension elements. Since both suspension elements are guided via at least one output shaft and consequently both suspension elements are driven, the forces are introduced symmetrically with respect to the center of gravity of the elevator car with the central suspension, thus avoiding any torque load on the car caused by these forces.The advantage of this design of the drive system is that two suspension elements are used to suspend the elevator car, and the distance between the two suspension elements can be influenced via the length of the output shaft, allowing the drive motor to be designed very simply. The at least one output shaft is arranged and designed in such a way that the guidance of the two suspension elements beneath the elevator car allows a distance between the suspension elements running from above towards the elevator car on the counterweight side that corresponds at least to the width of the at least one counterweight, with no suspension elements running between the car and the counterweight. This reduces the space required in the width of the shaft because there are no deflection pulleys and no suspension elements running between the elevator car and the counterweight.A further advantage of this drive system design is that the weight forces of the elevator car and the counterweight are only absorbed by the output shaft driven by the drive motor. Since only very low forces act in the drive shaft of the motor (which can also be used as a driving element) and in the transmission medium, the dimensions can be reduced, thereby also reducing the torque requirements of the drive. Furthermore, this drive system makes it possible to reduce the torque requirements of the drive motor via the size ratio of the driving element and the driven output shaft. The output shaft can also be designed with a stepped design. The transmission ratio can be designed very flexibly depending on requirements, which consequently allows the relationship between the drive speed and the car speed to be influenced. For example,Drive speed to car speed ratios of 1:1, 1.5:1, 2:1, 2.5:1, 3:1 or even higher can be achieved. This allows the size of the drive to be reduced through simple measures. The arrangement of the drive motor and output shaft below the elevator car has the advantage that they can be easily integrated into the L-shaped support frame of single-sided elevator cars and therefore does not result in any disadvantages in terms of the required space. Especially when belts or thin ropes are used as support means, the output shaft driven by the drive motor can have a small diameter. Mounting the drive motor and output shaft above the car would involve additional costs due to a more complex design of the support frame and would also be less advantageous in terms of space requirements. Since there is no drive at the top of the elevator shaft, the space required above the top floor can also be reduced to a minimum.The pulleys required in the elevator shaft have smaller dimensions so that the elevator car can pass by even if the shaft is narrow.

[0015] In one design, the elevator car is located between the suspension elements, which are guided beneath the elevator car by the output shaft and pulleys. The ends of the suspension elements are fixed, directly or indirectly, to two sides of the building structure. Several pulleys are arranged in the elevator shaft to guide the suspension elements. Due to the central suspension of the elevator car, the forces in the guide rails during travel are very low.

[0016] In one embodiment, all of the suspension elements run on the guide rail side, where all of the suspension element ends are also directly or indirectly fixed to the building structure. The advantage of this design is that all components are attached to just one shaft wall, which is sometimes necessary for construction reasons. In one embodiment, the two suspension elements each have a section that runs upwards on the side of the elevator car facing away from the guide rails, with these sections being arranged at a distance from one another that corresponds to at least 40% of a width that the elevator car has on the side facing away from the guide rails. These sections can in particular come from the at least one output shaft and lead to a receptacle on the shaft ceiling or, after prior deflection on the shaft ceiling, also to the shaft floor.The guide on the side facing away from the guide rails results in a particularly central suspension. Furthermore, the relatively wide spacing between the suspension elements on the side facing away from the guide rails offers plenty of clearance. In particular, the elevator car can have a door between the two sections.

[0017] In one embodiment, the two suspension elements are guided over the at least one output shaft at a distance from each other that corresponds at least to the length of the at least one drive motor. This allows the at least one drive motor to be arranged at the same height as the at least one output shaft, thus requiring less space under the elevator car.

[0018] In one embodiment, the two suspension elements run parallel to each other under the elevator car, which enables a simple design of the components for accommodating the deflection pulleys and the drive system.

[0019] In one design, the counterweight is also guided in guide rails.

[0020] In one embodiment, the car guide rails and the counterweight guide rails are attached to the adjacent shaft wall with rail holders. Each car guide rail is aligned with an adjacent counterweight guide rail so that the guide surfaces face in opposite directions and the rail holders are located between the guide rails. This arrangement of the guide rails requires less space in the shaft width, as all guide rails can be attached at the same distance from the adjacent shaft wall.

[0021] In one embodiment, the adjacent guide rails are secured to each other and to the shaft wall using rail holders. This reduces the need for fewer rail holders and reduces guide rail assembly time. Furthermore, the rail holders are constructed from two or more parts to facilitate easier adjustment of the guide rails.

[0022] In one embodiment, the elevator car is connected to an L-shaped support frame comprising a horizontal and a vertical support. At least the horizontal support has a tubular configuration, with deflection pulleys inserted into the tubular support, and a suspension element strand running through this tubular support. Thus, the deflection pulleys and the at least one shaft are integrated into the support structure in such a way that no additional space is required.

[0023] In a further embodiment, the length of the horizontal support and / or the vertical support of the support frame is adjustable. This design is achieved, for example, by using telescopic tubes that form a tubular frame, or by using other support elements that can be screwed together in different positions. By changing the support lengths, different cabin widths and cabin heights can be accommodated.

[0024] In one embodiment, the at least one drive motor and the at least one output shaft have a horizontally arranged axis of rotation. The axis of rotation is therefore located in a plane perpendicular to the direction of movement of the elevator. Such an arrangement enables the installation of a drive that minimizes the space required in the shaft below the lowest floor. Furthermore, a suspension element guide is possible that can be designed with particular flexibility to minimize the twisting of the two suspension element strands.

[0025] In one design, the axes of rotation are aligned parallel to a plane in which the counterweight moves, in addition to being horizontal. This allows for simple guidance of the two suspension elements with as few deflections as possible.

[0026] In one embodiment, deflection pulleys are arranged above the guide rails and inserted into a support structure that is attached to the car guide rails and / or the counterweight guide rails, or a combination of a car guide rail and a counterweight guide rail. This eliminates the need for any work on the shaft walls to attach the pulley supports, reducing costs.

[0027] In one embodiment, the two suspension elements are belt-shaped. By using belt-shaped suspension elements, e.g., flat belts, the drive systems are sufficiently compact to be integrated beneath the elevator car.

[0028] In one embodiment, the two suspension elements each have two or more suspension elements that are deflected separately. The suspension elements can be individual (steel) cables, for example. Multiple suspension elements increase safety and enable compliance with regulatory requirements while simultaneously limiting space requirements. The separate deflection ensures optimal guidance of each suspension element, which is particularly important for belt-shaped suspension elements.

[0029] In one embodiment, two consecutive deflection pulleys with non-parallel deflection axes are provided, via which one of the two suspension element strands is deflected one after the other, wherein the two deflection pulleys are spaced apart from one another by at least one length of the shortest side of the elevator car. The two non-parallel deflection axes can in particular be aligned orthogonally to one another and / or both can be arranged horizontally. The fact that the two deflection pulleys follow one another means that the suspension element strand in question is not deflected again between the two deflection pulleys, in particular that there is no further deflection pulley along the course of the suspension element strand between the two deflection pulleys. If a suspension element strand is deflected in different directions, the suspension element strand can twist between the two deflection pulleys, particularly in conjunction with belt-shaped suspension elements.To minimize this twisting, a large distance between the deflection pulleys is required. This sufficient distance spreads the twisting of the support element over a larger area, which has a positive effect on the service life of the support element. This distance can be achieved, in particular, by arranging the two deflection pulleys one above the other, in particular with a first deflection pulley at the lower end of the elevator car and a second deflection pulley at the upper end in the elevator shaft.

[0030] In one embodiment, a section of the respective suspension element strand running between the two deflection pulleys is arranged orthogonally to both deflection axes. This design has a positive effect on the load on the suspension element strand and its service life.

[0031] In one embodiment, at the sections of the drive system to which the at least one transmission means is guided and the power transmission takes place, the diameter of the drive body is smaller than the diameter of the at least one output shaft, which reduces the torque requirements of the drive. Consequently, the transmission ratio is greater than 1.

[0032] In one embodiment, the at least one output shaft is offset, and the sections over which the support means are guided have a smaller diameter than the section over which the at least one transmission means is guided. This reduces the torque requirements of the drive.

[0033] In one embodiment, two transmission means are used, which increases security.

[0034] In one embodiment, two output shafts and two transmission means are used, which makes it easier to install and replace the transmission means.

[0035] In one embodiment, the two suspension elements are guided over drive surfaces of the at least one output shaft in such a way that they wrap around the at least one output shaft by more than 90°. In particular, they can wrap around the at least one output shaft by more than 135° or even by at least 180°. This can be achieved, for example, by additionally arranged deflection pulleys in front of and behind the output shaft and has the advantage of increasing traction and allowing greater forces to be transmitted.

[0036] In one embodiment, the at least one output shaft is manufactured from one part, which has the advantage that few work steps are required during manufacture and assembly.

[0037] In one embodiment, the at least one output shaft is manufactured and assembled from several parts, which means that less material is required, for example in stepped designs.

[0038] In one embodiment, the at least one transmission means is designed as a closed device, which simplifies the design of the drive system. The invention is explained in more detail below with reference to the figures. They show:

[0039] Fig.1 : a simplified plan view of an elevator system;

[0040] Fig.1 a: a simplified sectional view of Fig. la

[0041] Fig. 2: a simplified plan view of a similar design as in Fig. 1, with changed number and arrangement of the cabin pulleys, as well as changed arrangement of the drive system and a one-piece offset output shaft;

[0042] Fig.2a: a simplified sectional view of Fig. 2

[0043] Fig. 3: a simplified plan view of a similar embodiment as in Fig. 1, using two output shafts and two toothed belts as transmission means;

[0044] Fig. 4: a simplified plan view of a similar design to that in Fig. 1, with a different arrangement of the ends of the suspension element strands, a stepped output shaft composed of several parts and a drive pulley connected to the drive shaft as a drive body;

[0045] Fig. 4a: a simplified sectional view of Fig. 4;

[0046] Fig. 5 : a simplified plan view of a similar embodiment as in Fig. 1 , with an additional deflection pulley in the elevator shaft and the use of connected suspension elements;

[0047] Fig. 5a: a simplified sectional view of Fig. 5

[0048] Fig. 6: A simplified plan view of a similar design to Fig. 1, with separately deflected support means. Fig. 7: A simplified plan view of a frequently used elevator system according to the prior art (not part of the invention).

[0049] The components are shown offset in the drawings to provide a better overview. The guide rails, the at least one counterweight, and the deflection pulleys in the elevator shaft are preferably arranged in alignment. The at least one drive motor and the at least one output shaft are preferably arranged at the same height.

[0050] Fig. 1 shows a simplified plan view of a machine room-less hoist system with a drive on the elevator car, comprising an elevator car 1, beneath which two deflection pulleys 9 and a drive system 16 are mounted. The drive system 16 is designed with a drive motor 6, a drive shaft integrated into the drive motor 6, which also serves as a drive body 7, an output shaft 14 not integrated into the drive motor 6, and a toothed belt as a transmission means 15. The output shaft 14 is formed at both ends with drive surfaces for receiving the suspension element strands 8. The closed toothed belt 15 is guided over the output shaft 14 and the drive body 7. The car guide rails 3 are arranged on one side of the elevator car 1.The counterweight guide rails 5, a counterweight 2, to which two deflection pulleys 4 are attached, and two deflection pulleys 10, which are fixedly attached directly or indirectly to the building structure at the top of the elevator shaft, are also arranged on the side of the car guide rails 3. The elevator car 1 is suspended in two strands of support means 8. Each support means strand 8 consists of one or more support means, which are schematically shown as a support means strand 8. The first support means strand ends 11 are fixedly attached directly or indirectly to the building structure. From there, the two support means strands 8 run via the output shaft 14 and the deflection pulleys 9 beneath the elevator car 1, then run upwards again and wrap around the deflection pulleys 10, which are fixedly attached directly or indirectly to the building structure. From there, they run downwards and then over the counterweight deflection pulleys 4.From the counterweight pulleys 4, they run upwards again, where the second suspension element strand ends 12 are directly or indirectly fixed to the building structure. For example, the

[0051] Ends of the support means 12 on components such as the roller scaffold or the

[0052] Guide rails are installed that are firmly attached to the building structure. The ratio of the effective diameters of the drive body 7 and the output shaft 14 is 1:2 (80 mm: 160 mm), which reduces the torque requirements of the drive by a factor of 2. The output shaft is a single piece and has the same diameter across all sections.

[0053] Fig. la: a simplified sectional view of Fig. 1

[0054] Fig. 2 shows a simplified top view of a similar design to Fig. 1, with the difference that three deflection pulleys 9 are mounted on each side of the elevator car 1 to increase the wrap angle of the suspension element strands 8 on the output shaft 14 and thereby improve traction behavior. Furthermore, the output shaft 14 is formed from a single piece, with the sections on which the suspension element strands 8 are guided having a smaller diameter than the section on which the transmission element 15 is guided.

[0055] Fig.2a: a simplified sectional view of Fig. 2

[0056] Fig. 3 shows a simplified plan view of a similar embodiment as in Fig. 1, with the difference that the drive system 16 is designed with a drive motor 6, two output shafts 14 and two toothed belts as transmission means 15.

[0057] Fig. 4 shows a simplified plan view of a similar design to Fig. 1, with the difference that all suspension element strand ends 11 are located on the guide rail side. The output shaft 14 is stepped and composed of several parts. The drive body 7 is a traction sheave connected to the drive shaft. The first suspension element strand ends 11 are fixedly attached directly or indirectly to the building structure. From there, the two suspension element strands 8 run over the deflection pulleys 9 on the elevator car 1, then they run over the output shaft 14 of the drive system 16 and are then guided back up by further deflection pulleys 9 on the elevator car 1.At the top of the elevator shaft, the suspension element strands 8 are guided back down to the counterweight deflection pulleys 4 by the deflection pulleys 10, which are directly or indirectly fixed to the building structure, from which they are guided back up to where the second suspension element strand ends 12 are directly or indirectly fixed to the building structure.

[0058] Fig. 4a shows a simplified sectional view of Fig. 4.

[0059] Fig. 5 shows a simplified plan view of a similar embodiment to Fig. 1, with the difference that the two suspension element strands 8 are connected at the ends and an additional deflection pulley 17 is attached above the counterweight 2 in the elevator shaft. The first suspension element strand ends 11 are directly or indirectly fixed to the building structure. From there, the connected suspension element strands 8 run via the output shaft 14 and the deflection pulley 9.1 under the elevator car 1, then upwards to the deflection pulley 10.1, which is directly or indirectly fixed to the building structure, from there back down via the counterweight deflection pulley 4.1 and then back up and over the deflection pulley 17. From the deflection pulley 17, the connected suspension element strands 8 lead back down to the counterweight deflection pulley 4.2 and then back up to the deflection pulley 10.2, from which they are guided back down to the elevator car 1.At the elevator car 1, the connected suspension strands 8 lead via the deflection pulley 9.2 and the output shaft 14 to the opposite side, then upwards again, where the second suspension strand ends 12 are directly or indirectly fixed to the building structure. The deflection pulley 17 does not move, even during operation. It enables the use of combined suspension strands 8, thus replacing two suspension end attachments.

[0060] Fig. 5a shows a simplified sectional view of Fig. 5. Fig. 6 shows a simplified plan view of a similar embodiment to Fig. 1, in which four flat belts are used as suspension elements. Each suspension element 8.1, 8.2 of a suspension element strand 8 is deflected upwards from the elevator car 1 by its own deflection pulley 25.1, 25.2. At the top of the elevator shaft, each suspension element 8.1, 8.2 is again deflected to the side by its own deflection pulley 26.1, 26.2. In between, the suspension elements 8.1, 8.2 are rotated. The deflection pulleys 25.1, 26.1 and 25.2, 26.2 are arranged one above the other. This arrangement of the deflection pulleys and the separate deflection of the suspension elements enables the rotation of flat suspension elements. The support elements 8.1, 8.2 are then guided downwards to the counterweight 2 by the deflection pulleys 10 in the elevator shaft.From the counterweight 2, they lead back up via the deflection pulleys 4, where the second ends of the suspension element strands 12 are directly or indirectly fixed to the building structure. The deflection pulleys 25.1 and 25.2 on the elevator car 1, as well as the deflection pulleys 26.1 and 26.2 in the elevator shaft, have separate axles.

[0061] Fig. 7 shows a simplified plan view of a frequently used prior art elevator system (not part of the invention), with an elevator car 21, beneath which two deflection pulleys 29 are mounted and which is guided in car guide rails 31, wherein the car guide rails 31 are arranged on two sides of the elevator car 21, and a drive system 48 which is arranged in the elevator shaft above the counterweight 22. The counterweight 22 is guided in counterweight guide rails 51 and provided with a deflection pulley 41. A suspension element strand 28 runs from the fixed point 61 downwards to the elevator car 21 and is guided via the deflection pulleys 29 to the opposite side, then back up again via the traction sheave 35 and then back down to the counterweight 22, from where it is guided back up to the fixed point 71 by the deflection pulley 41.

[0062] The invention is not limited to the examples of its embodiments described above, but many variations are possible within the scope of the inventive idea defined in the claims.

Claims

CLAIMS 1. Machine room-less elevator system with drive on the elevator car with • a lift car (1) which is guided in car guide rails (3), the car guide rails (3) being arranged on one side of the lift car (1), • at least one counterweight (2) mounted on the same side of the lift car (1) how the cabin guide rails (3) are arranged, • one or more support means which connect the elevator car (1) and the counterweight (2) and are moved by transmitting a force from the drive system (16), characterized in that • the drive system (16) has a traction mechanism and is formed at least from: at least one drive motor (6) with a drive body (7), at least one output shaft (14) not integrated into the drive motor (6) and at least one transmission means (15), wherein the at least one drive motor (6) cooperates with the at least one transmission means (15) to drive the at least one output shaft (14) by transmitting a force, and • the at least one drive motor (6), the at least one output shaft (14) and the at least one transmission means (15) are mounted under the elevator car (1), and • Supporting means which support the elevator car (1) and the at least one counterweight (2) connect, on the side of the elevator car (1) on which the at least one counterweight (2) is located in two suspension means strands (8) coming from above under the elevator car (1) and over which at least one output shaft (14) is guided, and • the distance between the two support means strands (8) coming from above on the side of the at least one counterweight (2) and running to the elevator car (1) corresponds at least to the width of the at least one counterweight (2), wherein the support means strands (8) are guided in such a way that no support means strand (8) runs between the elevator car (1) and the at least one counterweight (2), and • the two sections of the two support means strands (8) running under the elevator car (1) are not connected to each other.

2. Machine room-less elevator system with drive on the elevator car according to claim 1, characterized in that the two support means strands (8) guided under the elevator car (1) run upwards from the elevator car (1) on the side of the elevator car (1) facing away from the at least one counterweight (2).

3. Machine room-less elevator system with drive on the elevator car according to claim 2, characterized in that the distance between the two support means strands (8) extending upwards from the elevator car (1) corresponds to at least 40% of the width which the elevator car has on the side facing away from the at least one counterweight (2).

4. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 3, characterized in that the two support means strands (8) are guided at a distance from one another over the at least one shaft (14), and this distance corresponds at least to the length of the at least one drive motor (6).

5. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 4, characterized in that the two support means strands (8) are guided parallel to each other under the elevator car (1).

6. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 5, characterized in that the counterweight is also guided in guide rails.

7. Machine room-less elevator system with drive on the elevator car according to claim 6, characterized in that the car guide rails (3) and the counterweight guide rails (5) are fastened to the adjacent shaft wall with rail holders, wherein in each case a car guide rail (3) is aligned with an adjacent counterweight guide rail (5) such that the guide surfaces of the guide rails (3, 5) point in opposite directions and the rail holders are located between the guide rails (3, 5).

8. Machine room-less elevator system with drive on the elevator car according to claim 7, characterized in that these adjacent guide rails (3, 5) are fastened to each other and to the shaft wall with rail holders, and the rail holders are formed from two or more parts.

9. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 8, characterized in that the elevator car is connected to an L-shaped support frame which has a horizontal and a vertical support, wherein at least the horizontal support has a tubular design and deflection rollers are inserted into the tubular support and a support means strand (8) runs through this tubular support.

10. Machine room-less elevator system with drive on the elevator car according to claim 9, characterized in that the length of the horizontal support and / or the vertical support of the L-shaped support frame is adjustable.

11. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 10, characterized in that the at least one drive motor (6) has a horizontally arranged axis of rotation.

12. Machine room-less elevator system with drive on the elevator car according to claim 11, characterized in that the axis of rotation is aligned parallel to a plane in which the at least one counterweight (2) moves.

13. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 12, characterized in that deflection rollers (10) are arranged above the guide rails (3, 5) and are inserted into a supporting structure which is fastened to the car guide rails (3) and / or the counterweight guide rails (5), or a combination of a car guide rail (3) and a counterweight guide rail (5).

14. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 13, characterized in that the support means of the two support means strands (8) are band-shaped.

15. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 1 , characterized in that the two support means strands (8) each have two or more support means which are deflected separately.

16. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 15, characterized in that for each support means there are two successive deflection pulleys with non-parallel deflection axes, via which one of the two support means strands (8) is deflected, wherein the two deflection pulleys are spaced apart from one another by at least one length of the shortest side of the elevator car (1).

17. Machine room-less elevator system with drive on the elevator car according to claim 16, characterized in that a section of the respective support means strand (8) running between the two deflection pulleys is arranged orthogonally to both deflection axes.

18. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 17, characterized in that at the sections of the drive system (16) to which the at least one transmission means (15) is guided and the power transmission takes place, the diameter of the drive body (7) is smaller than the diameter of the at least one output shaft (14).

19. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 18, characterized in that the at least one output shaft (14) is designed to be offset, the sections over which the support means strands (8) are guided having a smaller diameter than the section over which the at least one transmission means (15) is guided.

20. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 19, characterized in that the two support means strands (8) are guided in such a way that they wrap around the at least one output shaft (14) by more than 90°.

21. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 20, characterized in that the at least one output shaft (14) consists of one part.

22. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 20, characterized in that the at least one output shaft (14) is composed of two or more parts.

3. Machine room-less elevator system with drive on the elevator car according to one of claims 1 to 22, characterized in that the at least one transmission means is designed to be closed.

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