EP2692607A1 - Suspension system for a railway vehicle with releasable rigid connection between the wheels - Google Patents

Abstract

The gear has a pair of wheels (2, 3) facing transverse to a travel direction and driven by motors (4, 5), which are transverse to the travel direction, where each motor comprises a rotor. A mechanical releasable connection (20) is arranged between the wheels. The mechanical releasable connection has mechanical interruptible wheel set axles, a wheel set shaft or a mechanical interruptible carrier. The connection interconnects the rotors of the motors and comprises two connectors connected with a clutch (21).

Description

The present invention relates to a powered chassis for rail vehicles, especially low-floor trams.

In rail vehicles, the coupling of left and right wheels is usually carried out by means of a wheelset axle or wheelset shaft. This adjusts the well-known sine wave of a bogie or chassis. This is a desired effect, which reduces the unilateral wheel wear in the straight-ahead drive-in, but also produces undesired direct longitudinal and indirect lateral slippage in cornering under certain conditions. The invention has for its object to provide a solution to this problem.

This object is achieved by a chassis according to the present invention, in particular by a chassis according to claim 1. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

According to a basic idea of the invention, a mechanically detachable, ie interruptible, rigid connection is created between pairs of opposite wheels, one of which is arranged on the right side of the vehicle and one on the left side of the vehicle. The connection runs transversely to the direction of travel or substantially transversely to the direction of travel. Due to the interruption, the driving behavior of the chassis can be influenced and specifically changed. By interrupting or removing the interruption, the driving behavior of the chassis can be adjusted depending on the situation, as explained below. The rigid connection can thus during vehicle operation, ie while driving the rail vehicle, be solved or interrupted or not solved or not interrupted. The chassis and especially the mechanically detachable, rigid connection are designed so that the connection can be solved while driving or can not be solved. As a result, the driving operation can take place either in a disconnected connection or in a disconnected connection, and the vehicle is ready to travel in both cases. In particular, a mechanically interchangeable wheelset axle or wheelset shaft described below or a mechanically interruptible carrier described below is designed such that it can be interrupted during the driving operation or can not be interrupted. The release, or the restoration, of the connection can be made while driving or while the vehicle is at a standstill.

An idea of this invention is that the connection between the wheels in the direction of view from above or from below is arranged on the chassis between the wheels, in particular between the wheel discs. Preferably, the connection is also in the viewing direction from the front or from the rear (viewing direction in the direction of the vehicle longitudinal axis) between the wheels, in particular between the wheel discs arranged.

The connection can connect rotating elements of both wheels with each other and turn with the wheels. The connection may be configured to transmit torque or transmit no torque. The compound may also rotate with the wheels or not. The connection may be wholly or partially fixed or wholly or partially co-rotating with the wheels. Known suspension or bogie elements such as axles, bearings, (axle) rockers, beams, motor housings, and the like may be incorporated in the connection. The connection is designed so that it can be mechanically interrupted in one place or in several places, for example by one or more couplings. All the above features can be combined with each other in any combination.

Specified is in particular a chassis of a rail vehicle, comprising transverse to the direction of each other in pairs opposite wheels, transverse to the direction of each other in pairs opposite motors which drive the wheels and each have a rotor and preferably each have a housing, wherein the chassis also has a mechanically detachable, having rigid connection, which is arranged between the two wheels, in particular a mechanically interruptible wheelset axle or wheelset shaft or a mechanically interruptible carrier, in particular a cross member.

• Ist die zwischen beiden Rädern angeordnete starre Verbindung geschlossen, kann das Verhalten einer Achse bzw. die Wirkung einer Achse, insbesondere einer Portalachse, bei den Fahreigenschaften erreicht werden, z.B. bezüglich Spurstabilität. Das Fahrverhalten eines Achsradsatzes bedeutet einen geringeren Rad- und Schienenverschleiß durch Sinuslaufverhalten insbesondere auf gerader Strecke sowie in großen Bögen, die bei Ausnutzung der Spurkranzkonizitäten schlupfreduziert befahren werden können. Dieser Vorteil wird dadurch erreicht, dass an der Achse kein Drehzahlunterschied für die Dauer der geschlossenen starren Verbindung auftreten kann und das Verhalten einer starren Radsatzachse oder -welle erreicht wird. Wird die Verbindung gelöst, so wird diese Wirkung aufgehoben, d.h. die starre Verbindung wird aufgehoben, so dass das Fahrverhalten des Fahrwerks je nach Situation angepasst werden kann. Drehzahlunterschiede der Räder sind bei gelöster Verbindung möglich und es kann beispielsweise ein geringer Rad- und Schienenverschleiß in engen Bögen erreicht werden.
• Ist die starre Verbindung beispielsweise eine Radsatzwelle oder eine Radsatzachse, so kann zwischen dem Verhalten eines Fahrwerks mit Radsatzachse oder Radsatzwelle (wenn die Verbindung hergestellt ist) oder dem Verhalten eines Losradfahrwerks (wenn die Verbindung gelöst ist) gewählt werden. Ein Vorteil eines Losradantriebes ist die Verringerung von Längs- in Kombination mit Querschlupfzuständen an der Rad-Schiene-Schnittstelle in engen Bögen, die zu Kurvenquietschen und Verschleiß führen.

By the mechanically releasable connection or special embodiments, which are described in detail below, in particular the following advantages are achieved:

• If the rigid connection arranged between the two wheels is closed, the behavior of an axle or the action of an axle, in particular a gantry axle, can be achieved in terms of driving characteristics, for example with regard to tracking stability. The driving behavior of a wheel set means a lower wheel and rail wear due to sinusoidal behavior especially on straight track as well as in large arcs, which can be navigated slip-reduced when using the wheel flange konizitäten. This advantage is achieved by the fact that no Speed difference for the duration of the closed rigid connection can occur and the behavior of a rigid axle or axle shaft is achieved. If the connection is released, this effect is canceled, ie the rigid connection is canceled, so that the driving behavior of the chassis can be adjusted depending on the situation. Speed differences of the wheels are possible with dissolved connection and it can, for example, a small wheel and rail wear can be achieved in tight arches.
• If the rigid connection is, for example, a wheelset axle or a wheel set axle, then it is possible to choose between the behavior of a chassis with wheelset axle or wheelset shaft (if the connection is made) or the behavior of a loose wheel drive (if the connection is released). An advantage of a loose-wheel drive is the reduction of longitudinal, in combination with cross-slip conditions at the wheel-rail interface in narrow bends, which lead to curve squeaks and wear.

The chassis is adaptable to different track conditions and to a desired driving behavior. As mentioned, the connection may be a wheelset axle or a wheelset shaft. Another example is a carrier which is arranged transversely to the direction of travel, at the ends of which the wheels are arranged and which, for example, connects two side members of a chassis. Such a carrier is also referred to as a "portal axle". The wheels may, for example, be mounted on longitudinal members or in the longitudinal direction of a bogie protruding wings and the portal axle may connect the wheels together.

The rigid connection can be mechanically interrupted by one or more couplings. The coupling can be arranged at different locations. For example, it may be disposed at one or both ends of a wheelset axle or wheelset shaft or a carrier. A coupling can also be arranged within a wheelset axle, a wheelset shaft, a carrier or a gantry axle, in which case the axle, the shaft, the girder or the gantry axle is divided into partial axles, partial shafts, partial girders or partial gantries.

The mechanically detachable rigid connection can also be referred to as a mechanically interruptible connection element. The mechanical interruption can be carried out in a controllable and controllable manner in relation to a frictional connection which is interrupted when interrupted.

Under a loose wheel is understood in the present invention, a wheel whose rotational movement is not coupled to the rotational movement of another wheel. However, loose wheels may be driven by a non-rotating axle, i. a not co-rotating with the wheels axis be connected.

As the engine, all usable from rail vehicle operation engines can be used, especially engines that are used for low-floor vehicles. It is possible, for example, to use electric asynchronous motors which may be provided with a gear and coupling elements in order to transmit power to the driven wheel. Preference is given to the use of an electric motor with high standstill torque and high drive torque, wherein an electric synchronous motor, in particular a permanently excited synchronous motor is particularly preferred. Such motors are known in the art. High standstill and drive torques allow the elimination of a transmission and other coupling elements and the electric machine can be connected directly to the wheel or the drive axle of the wheel. It can thus be dispensed with the use of a transmission to increase or reduce the drive torque by different translations. The elimination of such a transmission brings benefits through material cost and maintenance and conservation cost savings. Optionally, but not necessarily, a transmission may be used for a different purpose to overcome engine-to-drive axis distances. The design of optimized electrical machines with high standstill and drive torques also allows a compact installation space, so that the drive imposes no restrictions on the seating or the passage widths for the passenger compartment.

The landing gear may be a bogie or part of a bogie, or it may be attached to the underframe or body of a rail vehicle in any other known manner.

In the invention, two special variants are presented, which are described below. These variants can be combined with all other, subsequently described embodiments.

In a special variant (referred to as variant 1) of the invention, the chassis has two supports oriented parallel or substantially parallel to the vehicle longitudinal direction (also referred to as longitudinal members), on which the guidance and mounting of the wheels is realized.

The guidance and storage of the wheels is preferably carried out on rockers, which are connected to the longitudinal members. A rocker is preferably pivotably articulated to a longitudinal beam, in particular pivotally articulated at least over a horizontal and preferably transverse to the vehicle longitudinal axis.

The longitudinal members, and optionally the wings, are arranged on the right and left of the vehicle longitudinal axis. The wheels associated motors are placed in the variant 1 on the inside of the carrier or the wings, d. H. in the direction of the vehicle longitudinal axis or in the direction of the vehicle center with the output axis normal to the vehicle longitudinal axis.

When storing the wheels, a distinction is made between an inner bearing and an outer bearing. In the inner bearing, the wheel bearing is viewed from the wheel disc in the direction of the inside, i. arranged in the direction of the vehicle longitudinal axis. The inner bearing is used for example in a standard gauge. In the outer storage, the wheel bearing is viewed from the wheel disc in the direction of the outside of the vehicle.

Depending on the type of bearing of the wheels - inner bearing, for example, in standard gauge or external bearing in eg meter gauge, the torque transmission between the motor and the wheel must be ensured. For variant 1 and internal storage, see for example Fig. 1 , the motor is preferably fixedly connected to the rocker. The wheel bearing is preferably in the rocker. For variant 1 and external storage, see for example Fig. 5 , The engine is preferably mounted on the output shaft to which the wheel is also torque-tight. The output shaft is preferably mounted in the rocker. The motor, in particular its housing, is then preferably connected to the rocker via a torque support. The preferred kinematic solution in the variant 1 and the outer bearing is thus such that the motor output shaft rotatably drives the wheel, said wave is also the wheel bearing and stored in the rocker. At the same time, the motor is permanently connected to the rocker arm.

In a further variant (referred to as variant 2), the chassis has side members, to which preferably wings are connected, as indicated above. In contrast to variant 1, these are integrated with motors in the carriers or in the wings. The integrated into the carrier or swing motors simultaneously serve to guide and support the respective associated wheel. In particular, in variant 2, the motor is flush with the surface of the carrier or the surface of the rocker on the side facing the wheel essentially flush. Furthermore, in variant 2, the motor preferably ends flush with the surface of the carrier or the surface of the rocker on the side facing away from the wheel or substantially flush.

The advantage of these two variants 1 and 2 described above is that regardless of external or internal bearing of the wheels in the carrier or in the wings on the outside of the side members and the wings any desired arrangement and assembly of braking devices and wheels is possible because no spatial restriction by arranging traction motors and / or gears on the outside of the carrier or swing takes place. In particular, it is also possible to use wheels of any size and width, for example wheels with sprung tires, super-resilience or disc wheels.

In both variants, the rocker may also be adapted to the primary cushioning of the wheel, as known in bogies and suspensions.

The chassis according to the invention can be used for normal, wide gauge as well as for narrow gauge trolleys, which can be achieved by a suitable arrangement of motors and wheels. Examples of this are given in the exemplary embodiments.

Hereinafter, further specific embodiments will be described, which can be combined with the variants and embodiments described above.

In one embodiment of the invention, the mechanically releasable rigid connection connects the rotors of two motors, which lie opposite each other in pairs in relation to the direction of travel, with each other. In particular, the shafts or drive axles of the motors are connected to each other directly or indirectly, eg via further shaft parts. The connection may be a wheelset shaft which has at least two shaft parts which are connected to a coupling. At the location of the coupling, the connection is solvable. The wheelset shaft may be composed of two half-shafts, which are coupled together by means of the coupling. The two shaft parts or the two half-waves can be identical to the rotor shafts of the two motors. It is conceivable, for example, to extend the rotor shafts of both motors inwards, in the direction of the center of the vehicle, and preferably to couple them together on their end faces via a coupling. It is also possible to arrange a partial shaft between the rotor shafts of both motors and each front end of this partial shaft in each case via a Coupling coupling with the adjacent rotor shaft. Other variants, such as the extension of only one rotor shaft in the direction of the other rotor shaft to bridge the distance between the motors, are conceivable. The rotor shafts of the motors and optionally further shaft parts are preferably axially aligned.

By a controlled or controlled direct or indirect connection of the rotor shaft of a motor with the rotor shaft of an opposing engine, identical or different drive torques can be transmitted to the wheels, depending on whether the connection is broken or not. This can be achieved by a clutch which is inserted between the motors of two opposing wheels. The driving behavior is thereby changed specifically and situation-dependent. When the rigid connection is closed, the driving behavior of a wheel set is achieved, which means less wheel and rail wear due to sinusoidal behavior, especially on a straight line and in large arcs, which can be negotiated with reduced slip when using the flange eccentricities. This is achieved in that on the axis no speed difference for the duration of the closed rigid connection can occur and the behavior of a rigid wheelset axle or shaft is achieved. With open coupling, the handling of loose wheels is achieved, which means low wheel and rail wear in tight arches. An advantage of a loose-wheel drive is the reduction of longitudinal, in combination with cross-slip conditions at the wheel-rail interface in narrow bends, which lead to curve squeaks and wear.

In a further embodiment of the invention, in addition to the mechanically releasable rigid connection in the form of a co-rotating with the wheels (in-line) connection, a not running with the wheels connection is described, which connects the motors or parts thereof. Preferably, non-rotating parts of both motors, in particular the housing of the motors, can be connected to one another with the connection. In other words, non-rotating parts, in particular motor housings, are included in the rigid connection when considering these parts as part of the rigid connection. The engine parts included in the connection may be considered parts of a co-rotating or, if not co-rotating, parts of a non-co-rotating axle.

If motor housings are included in the connection, the motors are preferably arranged on the insides of the wheels in the direction of the vehicle longitudinal axis or vehicle center, as described in variant 1 above.

Due to the rigid connection of the housing, the driving behavior of a gantry axle can be achieved with reference to the wheels lying opposite one another. The machine casings can be designed to achieve the desired stiffnesses. In this embodiment, can be dispensed with an additional gantry axis, which in addition to the advantageous technical effect also cost, mass and life cycle cost savings can be achieved.

In general, in all embodiments of co-rotating or non-co-rotating connections, it is preferred that the mechanically releasable rigid connection be axially aligned with the axis of rotation of the wheels. In particular, this design is preferred when motors, in particular motor housing, are connected to each other, or when rotors of motors are interconnected.

In a direct mounting of a wheel on a drive motor, the unsprung mass of this unit is increased, which can adversely affect the prevailing at the wheel-rail interface force and torque ratios and can cause a disadvantage in the running quality. Therefore, in one embodiment of the invention wheels are used which have a wheel disc with an integrated spring element. Examples include wheels in the wheel disc one or more resilient elements are integrated, in particular made of rubber. If the compositions of wheel disc to tire a particularly high degree of rubber elements, and preferably a particularly advantageous geometry and arrangement of these rubber elements, one speaks of so-called "super-resilient" wheels. All otherwise customary, sprung in wheels are used.

In a variant of a chassis, the chassis has two pairs of wheels. In particular, the chassis is a bogie with two pairs of wheels.

Finally, the invention also relates to a rail vehicle, in particular a low-floor tram, having a chassis described above, wherein all general and specific embodiments of the foregoing description can be used.

Fig. 1

ein Teil eines Fahrwerks nach dem Stand der Technik in Normalspur mit Innenlagerung der Räder sowie Motoren, die auf der Innenseite von Längsträgern und Schwingen platziert sind;

Fig. 2a, 2b

ein erfindungsgemäßes Beispiel für ein Fahrwerk mit Innenlagerung der Räder in verschiedenen Perspektiven mit innenseitig der Längsträger und Schwingen angeordneten Motoren, wie in Fig. 1, wobei Gehäuse und/oder Rotoren der Motoren miteinander verbindbar sind;

Fig. 3

einen Ausschnitt aus einem Fahrwerk mit Innenlagerung der Räder nach dem Stand der Technik mit einer starren Radsatzachse oder Radsatzwelle, wobei Antriebsmotoren in Schwingen integriert sind;

Fig. 4a, 4b

erfindungsgemäße Fahrwerke mit Innenlagerung der Räder in verschiedenen Perspektiven, wobei eine unterbrechbare Radsatzwelle oder Radsatzachse zwischen den Rädern angeordnet ist und die Antriebsmotoren wie in Fig. 3 in Schwingen integriert sind;

Fig. 5

einen Ausschnitt aus einem Fahrwerk nach dem Stand der Technik in Außenlagerung der Räder, mit schmaler Spurweite, wobei die Motoren auf der Innenseite Schwingen platziert sind;

Fig. 6a, 6b

Ausschnitte aus einem erfindungsgemäßen Fahrwerk in verschiedenen Perspektiven in Außenlagerung/Schmalspur-Ausführung, wobei Motoren auf der Innenseite der Räder angeordnet sind, wobei Gehäuse und/oder Rotoren der Motoren miteinander verbindbar sind;

Fig. 7

einen Ausschnitt aus einem Fahrwerk nach dem Stand der Technik in Außenlagerung/Schmalspurbauweise mit einer starren Radsatzachse und in die Schwingen integrierten Antriebsmotoren; und

Fig. 8a, 8b

Ausschnitte aus einem erfindungsgemäßen Fahrwerk in verschiedenen Ansichten mit einer unterbrechbaren Radsatzachse, in Außenlagerung / Schmalspurausführung mit in die Schwingen integrierten Antriebsmotoren.

The invention will be described below with reference to specific embodiments. Show it:

Fig. 1

a part of a prior art landing gear in standard gauge with wheels internally mounted and motors placed on the inside of side members and rockers;

Fig. 2a, 2b

an inventive example of a chassis with inner bearing of the wheels in different perspectives with the inside of the side members and rockers arranged engines, as in Fig. 1 wherein housing and / or rotors of the motors are connectable to each other;

Fig. 3

a detail of a chassis with inner bearing of the wheels according to the prior art with a rigid wheelset or axle, with drive motors are integrated into wings;

Fig. 4a, 4b

Undercarriage according to the invention with inner bearing of the wheels in different perspectives, wherein an interruptible axle or wheelset axle between the wheels is arranged and the drive motors as in Fig. 3 integrated in wings;

Fig. 5

a detail of a prior art landing gear in outer bearing of the wheels, narrow gauge, the motors are placed on the inside swinging;

Fig. 6a, 6b

Parts of a chassis according to the invention in different perspectives in outdoor storage / narrow gauge design, with motors are arranged on the inside of the wheels, wherein the housing and / or rotors of the motors are connected to each other;

Fig. 7

a section of a chassis according to the prior art in outdoor storage / narrow gauge construction with a rigid wheelset and integrated into the swing drive motors; and

Fig. 8a, 8b

Excerpts from a chassis according to the invention in different views with an interruptible wheelset, in outdoor storage / narrow-gauge design with integrated into the wings drive motors.

The Fig. 1, 2a and 2 B show in many parts a same structure, where the Fig. 1 the state of the art and the Fig. 2a and 2 B represent the example of the invention. The Fig. 1 shows a part of a bogie in a view from above. The Fig. 2b shows the same view of an example according to the invention and the Fig. 2a shows a view from the front. Shown is in each case a chassis 1, in this case a part of a bogie, transverse to the direction of each other in pairs opposite wheels 2, 3 and transverse to the direction of each other in pairs opposite motors 4, 5. Within the motors 4, 5 is not visible in each case a rotor arranged, which is enclosed by a respective housing 6, 7. Furthermore show the landing gear According to the invention and not embodiments of the invention longitudinal beams 22, 23 and attached to the longitudinal beams rockers 8, 9. On the outside of the wheels brake discs 10, 11 are arranged with brake calipers 12, 13. Also shown are both in the chassis according to the prior art as in the chassis according to the invention in each case a cross member 14, support points for secondary springs 15, 16, and damper 17, 18. The features 10 to 18 are also components in other non inventive and inventive suspensions that in the Fig. 3 to 8 are not pictured or described there in their entirety.

In contrast to the chassis according to the prior art of Fig. 1 is in the chassis according to the invention the Fig. 2a and 2 B a mechanically detachable, rigid connection 20 is provided. The connection 20 connects the end faces of the motor housing 6, 7 with each other. The connection 20 is releasable by a coupling 21, so that the motor housing 6, 7 can be separated from each other again by the clutch is actuated. In the embodiment shown the Fig. 2a . 2 B Do not rotate the motor housing 6, 7 with the wheels 2, 3 and are screwed on the inside of the wings 8, 9 or otherwise connected to the wings. The rigid connection 20 is not a co-rotating with the wheels 2, 3 compound. By the motor housing 6, 7 and the rigid connection 20 a non-co-rotating, rigid axis is formed. The connection 20 may be considered as a rigid gantry axle or as part of a rigid gantry axle when the housings 6, 7 are included.

Alternatively, it may be provided that the connection 20 is a connection which not only connects housings 6, 7 of motors 4, 5, but also includes an unillustrated co-rotating connection connecting the rotors of the motors 4, 5, not shown, and which can decouple these rotors through the coupling 21.

The Fig. 3 . 4a and 4b show a further variant of a suspension of the prior art ( Fig. 3 ) and an inventive ( Fig. 4a, 4b) Landing gear. In these chassis, the motors are integrated into the wings 8, 9 and therefore not visible in the figures. It is the mentioned in the general description variant 2 to the engine assembly, whereas the Fig. 1, 2a and 2 B represent the variant 1. In the Fig. 3 the wheels 2, 3 are connected by a rigid rotating axis 30. In the chassis of the invention Fig. 4a and 4b show the Fig. 4a a view from the front and the Fig. 4b , as Fig. 3 , a view from above. Between the wheels 2, 3 a wheel set shaft 20 is arranged, which connects the rotors (not shown) of the motors (integrated in the wings 8, 9) with each other. The wheelset shaft 20 thus represents a rigid connection between the two wheels 2, 3, the torque transmits as it couples the rotors of the motors. The connection 20 can be mechanically interrupted by means of a coupling 21. The clutch 21 is disposed on the side of the wheel or on the side of the integrated into the rocker 8 motor. However, it is also conceivable to arrange the coupling 21 in the center and to guide shaft parts on both sides of the coupling, to the right and to the left, to the motors, which in turn are connected to the rotors of the motors.

The Fig. 5, 6a and 6b are each directly with the Fig. 1, 2a and 2 B comparable. Unlike the Fig. 1 to 2 are at the Fig. 5 to 6 the wheels 2, 3 arranged on the inside of rockers 8, 9, whereby a narrower track is made possible by means of external storage. The motors 4, 5 are each arranged on the inside of the wheels 2, 3 and are connected via moment supports 24, 25 with the wings 8, 9. The Fig. 5 represents the state of the art and is directly with the Fig. 1 comparable and the Fig. 6a and 6b represent an example according to the invention from two different perspectives (from the front, from above) of a chassis according to the invention Fig. 6a and 6b the end faces of the motor housing 6, 7 can be connected by a connection 20. The connection 20 can be interrupted by a coupling 21.

The Fig. 7 . 8a and 8b are directly with the Fig. 3 . 4a and 4b comparable, the Fig. 7 . 8a and 8b represent a Schmalspurfahrwerk in outdoor storage, in which the wheels 2, 3 are arranged on the inside of wings 8, 9. In the Fig. 7 is the same as in the Fig. 3 a rigid wheel axle 30 between the wheels 2, 3, whereas in the examples of the invention Fig. 8a and 8b between the wheels 2, 3 a detachable with a coupling 21 connection 20 is arranged. As in the Fig. 4a and 4b the linkage 20 is a rigid wheelset shaft co-rotating with the wheels 2, 3, connecting the rotors (not shown) of the motors (integrated into rockers 8, 9, not shown).

Claims (9)

Chassis (1) of a rail vehicle, comprising
transverse to the direction of travel each other in pairs opposite wheels (2,3),
transverse to the direction of travel each other in pairs opposite motors (4,5), which drive the wheels (2,3) and each having a rotor,
marked by
a mechanically releasable, rigid connection (20) which is arranged between the two wheels (2, 3), wherein the mechanically detachable, rigid connection is a mechanically interruptible wheelset axle or wheelset shaft or a mechanically interruptible carrier. Is running gear according to claim 1, characterized in that the compound (20), the rotors of the motors connected (4,5) to one another and configured as a wheel set shaft. Chassis according to Claim 1, characterized in that the connection is a wheel set axle (20) running along with the wheels or not running with the wheels (2, 3), which drives the motors (4, 5) or parts of the motors (6, 7). connects with each other. Chassis according to claim 3, characterized in that the compound is a not with the wheels (2,3) follower wheelset (20), or a part of a wheelset, and the connection housing (6,7) of the motors together. Suspension according to one of the preceding claims, characterized in that the connection (20) has at least two connecting elements which are connected to a coupling (21). Bogie according to one of the preceding claims, characterized in that the connection (20) is axially aligned with the axis of rotation of the wheels. Suspension according to one of the preceding claims, characterized in that the wheels (2,3) have a wheel disc with an integrated spring element. Landing gear according to one of the preceding claims, comprising two pairs of wheels. Rail vehicle, in particular low-floor tram, comprising a chassis according to one of the preceding claims.

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