Running gear for a rail vehicle, and rail vehicle

Abstract

The invention relates to a running gear for a rail vehicle with a supporting structure (1), which has at least a first longitudinal member (2) and a second longitudinal member (3) and at least a first cross member (4) and to which at least a first wheel (8) and a second wheel (9) are rotatably connected, and with at least a first motor (14) and at least a first transmission (16) coupled to the at least first motor (14), which are coupled to at least the first wheel (8) for torque transmission. It is proposed that the at least first motor (14) is inserted into a first opening (18) of the first longitudinal member (2), wherein an idler pair is formed from the first wheel (8) and the second wheel (9). The available installation space budget can thus be enlarged.

Description

[0001] Chassis for a rail vehicle and rail vehicle

[0002] The invention relates to a chassis for a rail vehicle with a support structure which has at least a first longitudinal member and a second longitudinal member as well as at least one first cross member and with which at least a first wheel and a second wheel are rotatably connected, as well as with at least a first motor and at least one first transmission coupled to the at least first motor, which are coupled to at least the first wheel for torque transmission.

[0003] Due to limited space, running gear for rail vehicles often has limited installation space for running gear components. For example, in low-floor vehicles, the vehicle floor is lowered between the running gear wheels, which may require running gear components such as engines, transmissions, clutches, brakes, etc. to be located on the outside of the running gear. However, these running gear components must not protrude excessively far outwards from the side of the running gear or from a rail vehicle.

[0004] From the prior art, for example, WO 2017 / 093094 A1 is known, in which a running gear of a rail vehicle is disclosed. The running gear has a running gear frame and wheel sets. The running gear frame comprises two longitudinal members aligned in the longitudinal direction of the running gear and a cross member arranged between the longitudinal members, connected to the longitudinal members and aligned in the transverse direction of the running gear. At least one drive unit is integrated into the cross member, which drive unit is connected to the wheel sets via a power transmission device arranged between the longitudinal members and coupled to the wheel sets. Furthermore, WO 2020 / 192860 A1 shows a running gear for a low-floor rail vehicle with a primary spring device which comprises at least four torsion bars.

[0005] Furthermore, EP 3 854 655 A1 describes a running gear of a rail vehicle with four idler wheels that are rotatably coupled to a running gear frame. Each of these four idler wheels is assigned a motor, a transmission, and a braking device, which are arranged outside an area bounded by the four idler wheels. A total of four motors, four transmissions, and four braking devices are arranged.

[0006] The approach mentioned in its known form has the disadvantage that a considerable amount of space is taken up by the motors on the side flanks of the chassis.

[0007] Furthermore, EP 3 310 636 B1 discloses a bogie for a high-floor rail vehicle with wheelsets in which wheels are coupled to one another via axle shafts. Transversely aligned drive motors are mechanically integrated into the longitudinal beams of a bogie frame of the bogie, i.e., mounted in recesses in the longitudinal beams, and coupled to the wheelsets via spur gears mounted on the outer sides of the bogie.

[0008] The invention is based on the object of specifying a chassis which is further developed compared to the prior art, in particular which is compact in the chassis transverse direction and which has an intermediate area between the first wheel and the second wheel which can be used as well as possible.

[0009] According to the invention, this object is achieved with a chassis according to claim 1, in which the at least first motor is introduced into a first opening in the first longitudinal member, a loose wheel pair being formed from the first wheel and the second wheel. The first opening can, for example, be continuous, i.e., penetrate the first longitudinal member and be completely enclosed by the first longitudinal member on the casing side. The first opening can, for example, be designed as a cylindrical through-hole or as a through-hole with an oval cross-section or with a rectangular cross-section with rounded corners, etc. A distance can be formed between the first motor in the first opening and the first longitudinal member.

[0010] Because the first motor is introduced into the first opening, it places no or only a small burden on the available installation space in an area between the first longitudinal member and the second longitudinal member and in areas of the chassis outer sides. Therefore, if the chassis is used in a low-floor rail vehicle, for example, it is possible to dimension a passenger aisle width in a car body of the low-floor rail vehicle, which can extend downwards into the area between the first longitudinal member and the second longitudinal member, as a result of which passenger comfort can be increased. This is particularly advantageous, for example, if the cross-section of the car body is to be designed with a narrow width.

[0011] Furthermore, in connection with a possible use of the chassis in a low-floor rail vehicle, it is conceivable, for example, to design platforms for seats in the car body, which are often designed as wheel arches in which drive components of the low-floor rail vehicle can be arranged, with a moderate overall height, since in the chassis according to the invention an arrangement of the first motor above the support structure can be avoided.

[0012] Instead of a wheel set with wheels connected to one another by a wheel set shaft, the running gear according to the invention has a pair of loose wheels comprising individual wheels, which makes the running gear according to the invention particularly suitable for use in a low-floor rail vehicle. Further advantageous embodiments of the running gear according to the invention are set out in the subclaims.

[0013] It is advantageous, for example, if the first opening is offset from a contact zone in which the first longitudinal member and the at least first cross member are connected to one another, in the direction of a chassis longitudinal axis. This measure keeps installation space free in the area of ​​the first cross member and can be used, for example, to arrange a secondary spring. If a secondary spring is used, it can have a large spring base, which means that, for example, a chassis anti-roll bar can be dispensed with.

[0014] Furthermore, the fact that the first opening is offset from the contact zone protects the contact zone from excessive loads caused by the first motor.

[0015] A preferred solution is obtained if at least the first gear is arranged as a spur gear on the outside of the chassis.

[0016] This prevents the first gear from excessively enlarging the chassis, for example by widening it, since a spur gear can be made narrower, narrower than, for example, a bevel gear.

[0017] It can also be helpful if a cardan shaft coupled to the at least first transmission is guided through a central, continuous cavity of the first wheel, wherein the at least first transmission is arranged in the region of a first end face of the first wheel and the cardan shaft is coupled to the first wheel in the region of a second end face of the first wheel.

[0018] This results in a compact coupling of the first transmission with the first wheel and enables a reduction in the unsprung masses of the chassis. On the one hand, this simplifies the implementation of a chassis with external bearings, i.e., an arrangement of the first wheel and the second wheel in an area between the first longitudinal member and the second longitudinal member. On the other hand, this avoids the need for, for example, a transmission shaft to be guided past the first wheel starting from the first end face of the first wheel and to be coupled to the first wheel, for example by means of a further transmission in the area of ​​the second end face of the first wheel.

[0019] An effective compensation of misalignment errors and relative movements etc. between the first gear and the first wheel is made possible if the at least first gear is coupled to the first wheel via at least one first clutch, preferably via a first clutch, via which the cardan shaft is coupled to the first wheel, and via a second clutch, via which the cardan shaft is coupled to the at least first gear.

[0020] Static moments due to wheel static forces, which can lead to a heavy load on a wheel bearing device, can be avoided if a wheel bearing is arranged in the cavity and connected to the first wheel, wherein the first wheel is coupled to the support structure via the wheel bearing.

[0021] A favorable solution is achieved if the at least first gear is connected to the support structure via a gear bearing , wherein the at least first motor is carried by means of the at least first gear .

[0022] The gearbox mounting can be designed, for example, as a three-point bearing. The three-point bearing can, for example, be implemented using three elastic bearings. This prevents the first gearbox from severely restricting the deformability of the supporting structure.

[0023] The first motor is not mounted in the first opening of the first longitudinal member, i.e., it is not mechanically integrated into the first longitudinal member. This prevents strong, direct mechanical loading of the first longitudinal member by the first motor in the area of ​​the first opening.

[0024] However, with regard to a moderate load on the support structure, it may also be advantageous if the at least first transmission is supported on a shaft connected to the first wheel and is connected to the support structure via a torque support, wherein the at least first motor is supported by means of the at least first transmission.

[0025] The shaft connected to the first wheel is not connected to the second wheel.

[0026] A space advantage is achieved for a chassis with a chassis brake device if a first brake disc is connected to a motor shaft of the at least first motor on a side of the at least first motor facing away from the at least first transmission.

[0027] This allows for a space-saving distribution of chassis components within the available installation space. An advantageous solution is achieved when the longitudinal engine axis is aligned parallel or approximately parallel to the transverse chassis axis.

[0028] By means of this measure, if, for example, a wheel axis of the first wheel is aligned parallel to the longitudinal axis of the motor shaft or is not excessively rotated relative to the longitudinal axis of the motor shaft, a complex gear (e.g. a bevel gear) between the first motor and the first wheel can be dispensed with.

[0029] A torsionally flexible chassis with safe and low-wear driving behavior can be achieved if structural components of the chassis include at least one open first profile.

[0030] To promote barrier-free local or long-distance transport, it can be helpful if a free running gear area for a lowered vehicle floor for a low-floor rail vehicle is created between the first wheel and the second wheel.

[0031] A compact chassis with an external bearing is obtained when the first wheel and the second wheel are arranged in an area between the first longitudinal member and the second longitudinal member.

[0032] A high level of driving safety and driving comfort can be achieved with the chassis if a spring device is connected to the support structure, wherein the first wheel and the second wheel are connected to the support structure via an axle bridge and a primary spring arrangement of the spring device and a secondary spring arrangement of the spring device is connected to the support structure on the outside of the chassis.

[0033] A promising field of application for the chassis according to the invention with regard to an efficient utilization of an available installation space budget is developed with a rail vehicle with at least one chassis according to the invention.

[0034] The invention is explained in more detail below using exemplary embodiments.

[0035] Examples include:

[0036] Fig. 1: An oblique view of an exemplary first embodiment of a running gear according to the invention for a rail vehicle with a support device, four wheels, four motors and four transmissions, each of these four wheels being assigned a motor and a transmission, the motors being inserted into openings of longitudinal beams of the support structure,

[0037] Fig. 2: An oblique view of an exemplary embodiment of a support structure for a chassis according to the invention, wherein longitudinal beams of the support structure have openings for the engines of the chassis,

[0038] Fig. 3: A side view of a section of an exemplary embodiment of a rail vehicle according to the invention with an exemplary second embodiment of a running gear according to the invention with a first gear designed as a two-stage spur gear on a running gear outer side,

[0039] Fig. 4: A plan view of a section of an exemplary third embodiment of a chassis according to the invention with a first gear designed as a two-stage spur gear, wherein on a side facing away from the first gear of a first motor of the chassis, which is inserted into a first opening of a first longitudinal member of a support structure of the chassis, a first brake disc of the chassis is connected to a motor shaft of the first

[0040] motor is connected, and

[0041] Fig. 5: A side view of a section of an exemplary fourth embodiment of a chassis according to the invention in a sectional view, wherein a first wheel of the chassis has a central and continuous cavity in which a wheel bearing of the chassis is arranged and through which a cardan shaft of the

[0042] Chassis, via which a first gear of the chassis and the first wheel are coupled to one another.

[0043] Fig. 1 shows an oblique view of an exemplary first embodiment of a chassis according to the invention for a low-floor rail vehicle designed as a tram. The chassis has a support structure 1 designed as a chassis frame, which comprises a first longitudinal member 2, a second longitudinal member 3, a first cross member 4, and a second cross member 5.

[0044] The first longitudinal member 2 and the second longitudinal member 3 are arranged to extend in the direction of a chassis longitudinal axis 6, the first cross member 4 and the second cross member 5 are arranged to extend in the direction of a chassis transverse axis 7.

[0045] The chassis further comprises a first wheel 8 and a second wheel 9, from which a first loose wheel pair is formed, as well as two further wheels, from which a second loose wheel pair is formed.

[0046] The first wheel 8, the second wheel 9, and the two other wheels are designed as individual wheels. Connections between the first wheel 8 and the second wheel 9, as well as between the two other wheels, are not formed by wheelset shafts. The first pair of loose wheels and the second pair of loose wheels are not wheelsets with wheelset shafts.

[0047] Between the first wheel 8 and the second wheel 9 as well as between the two further wheels, a free running gear area is formed for a lowered vehicle floor of the low-floor rail vehicle.

[0048] The first wheel 8 and the second wheel 9 are arranged in a region between the first longitudinal member 2 and the second longitudinal member 3. The chassis therefore has an external bearing.

[0049] The first wheel 8 and the second wheel 9 are rotatably mounted in an axle bridge 10, which has an approximately O-shape. The axle bridge 10 is connected to the first longitudinal member 2 and the second longitudinal member 3 via a primary spring arrangement of a spring device of the chassis, which comprises a first primary spring 11 and further primary springs.

[0050] The second pair of loose wheels is designed, connected and functionally identical to the first pair of loose wheels and is coupled to the support structure 1.

[0051] The spring device further comprises a secondary spring arrangement with a first secondary spring 12 and a second secondary spring 13, which are connected to the support structure 1 on the chassis outside, in regions of first ends of the first cross member 4 and the second cross member 5 and second ends of the first cross member 4 and the second cross member 5. Furthermore, the chassis comprises a damping device.

[0052] The chassis further comprises a first motor 14, a second motor 15 and two further motors as well as a first gearbox 16 with a first gearbox housing, a second gearbox 17 with a second gearbox housing and two further gearboxes with two further gearbox housings. The first motor 14 is designed as an electric motor and is introduced into a first opening 18 of the first longitudinal member 2, as shown by way of example in Fig. 2. A longitudinal motor axis 20 is aligned parallel to the chassis transverse axis 7. A small distance is provided between the first motor 14 in the first opening 18 and the first longitudinal member 2.

[0053] The first transmission 16 is designed as a two-stage spur gear transmission and is connected to the first longitudinal member 2 on an outer side of the chassis via the first transmission housing by means of a transmission bearing designed as an elastic three-point bearing. The first longitudinal member 2 is arranged between the first transmission 16 and the first wheel 8. The first motor 14 has a motor housing via which it is connected to the first transmission housing of the first transmission 16, thereby preventing displacement of the first motor 14 in the first opening 18. The first motor 14 is connected to the first longitudinal member 2 exclusively via the first transmission 16, i.e. it does not have its own motor bearings. The first motor 14 is thus supported by means of the first transmission 16 and is therefore not mechanically integrated into the first longitudinal member 2, i.e. it is not mounted in the first opening 18.

[0054] According to the invention, however, it is also conceivable that, for example, the first gear 16 is supported on a shaft connected to the first wheel 8 and is connected to the support structure 1 via a torque support, wherein the first motor 14 is supported by means of the first gear 16. The shaft connected to the first wheel 8 is, however, not connected to the second wheel 9.

[0055] The first transmission 16 is in turn coupled to the first wheel 8, whereby the first motor 14 is coupled to the first wheel 8 via the first transmission 16 for torque transmission.

[0056] The second motor 15 is also designed as an electric motor and is introduced into a second opening 19 of the second longitudinal member 3, as shown by way of example in Fig. 2. The second motor 15 is coupled to the second wheel 9 for torque transmission via the second gear 17, which is designed as a two-stage spur gear. The second motor 15 and the second gear 17 correspond structurally, in terms of connection technology and function to the first motor 14 and the first gear 16. The second longitudinal member 3 is arranged between the second gear 17 and the second wheel 9.

[0057] The two additional motors are inserted into two additional openings in the first longitudinal member 2 and the second longitudinal member 3. The two additional motors are coupled to the two additional wheels via the two additional transmissions for torque transmission. The two additional motors and the two additional transmissions correspond structurally, in terms of connection technology, and functionally to the first motor 14 and the second motor 15, as well as to the first transmission 16 and the second transmission 17.

[0058] The use of the first loose wheel pair and the second loose wheel pair in the running gear according to the invention, in conjunction with the first motor 14, the second motor 15 and the two further motors in their design and arrangement shown in Fig. 1 and a low overall height achieved thereby, enables the running gear according to the invention to be used in the low-floor rail vehicle, in contrast to a running gear not according to the invention with wheel sets in which wheels are connected to one another by means of wheel set shafts.

[0059] On a side of the first motor 14 facing away from the first transmission 16, a first brake disc 21 designed as a monoblock brake disc is connected to a motor shaft 23 of the first motor 14, as shown by way of example in Fig. 3 and Fig. 4. The first longitudinal member 2 is arranged between the first transmission 16 and the first brake disc 21. The first brake disc 21 is arranged in the area between the first longitudinal member 2 and the second longitudinal member 3.

[0060] A second brake disc 22 is connected to the second motor 15. A further brake disc is connected to each of the two other motors. Thus, a total of two further brake discs are connected to the two other motors.

[0061] The second brake disc 22 and the two further brake discs correspond in terms of construction, connection technology and function to the first brake disc 21 .

[0062] Fig. 2 shows an oblique view of an exemplary embodiment of a support structure 1 for a chassis according to the invention, as shown by way of example in Fig. 1.

[0063] The support structure 1 is designed as a chassis frame and comprises a first longitudinal member 2, a second longitudinal member 3, a first cross member 4 and a second cross member 5. The first longitudinal member 2 and the second longitudinal member 3 are arranged to extend in the direction of a chassis longitudinal axis 6, as shown by way of example in Fig. 1, the first cross member 4 and the second cross member 5 extend in the direction of a chassis transverse axis 7, as shown by way of example in Fig. 1.

[0064] The first longitudinal member 2 has a cylindrical first opening 18, which extends through the first longitudinal member 2. A first motor 14, as shown by way of example in Fig. 1, can be arranged in the first opening 18, wherein an opening longitudinal axis 24 of the first opening 18 is aligned parallel to a motor longitudinal axis 20, as shown by way of example in Fig. 1, of the first motor 14 and to the chassis transverse axis 7.

[0065] The second longitudinal member 3 has a cylindrical second opening 19 in which a second motor 15, as shown by way of example in Fig. 1, can be arranged. The first longitudinal member 2 and the second longitudinal member 3 further have two further openings in which two further motors can be arranged. The second opening 19 and the two further openings correspond to the first opening 18 in terms of structural and geometric principles.

[0066] The first opening 18, the second opening 19, and the two further openings are offset from contact zones in which the first longitudinal member 2 and the second longitudinal member 3 are connected to the first cross member 4 and the second cross member 5, in the direction of the chassis longitudinal axis 6, and border this contact zone. The first opening 18, the second opening 19, and the two further openings thus border the first cross member 4 and the second cross member 5, which are arranged in a central section of the support structure 1.

[0067] The first longitudinal member 2 has a first bearing bush 25, a second bearing bush 26 and a third bearing bush 27, to which elastic bearings for a three-point bearing of a first transmission 16, as shown by way of example in Fig. 1, can be connected.

[0068] The first longitudinal member 2 and the second longitudinal member 3 also comprise nine further bearing bushes for a second gear 17 and two further gears, which are described in connection with Fig. 1.

[0069] A primary spring arrangement of a spring device, as described by way of example in connection with Fig. 1, is connected to the first longitudinal member 2 and the second longitudinal member 3, wherein the primary spring arrangement comprises a first primary spring 11 and seven further primary springs.

[0070] Fig. 3 discloses a side view of a section of an exemplary embodiment of a rail vehicle according to the invention with an exemplary second embodiment of a running gear according to the invention. Fig. 3 shows a side view of the rail vehicle.

[0071] The rail vehicle is designed as a low-floor tram, in which a car body 28 is supported on the chassis via a secondary spring arrangement of a spring device of the chassis. The chassis also has a damping device via which the car body and the chassis are coupled to one another.

[0072] A first secondary spring 12 designed as a metallic helical spring between the car body 28 and the chassis is arranged in a central section of a support structure 1 of the chassis.

[0073] The support structure 1 has a first longitudinal member 2 which is coupled to an axle bridge 10 of the chassis via a first primary spring 11 and a further primary spring (not visible in Fig. 3) of a primary spring arrangement of a spring device of the chassis.

[0074] The first primary spring 11 and the further primary spring are designed as rubber-metal springs.

[0075] A first wheel 8 and a second wheel 9, as shown by way of example in Fig. 1, from which a pair of loose wheels is formed, are rotatably connected to the axle bridge 10.

[0076] A first motor 14 of the chassis is inserted into a cylindrical first opening 18 of the first longitudinal member 2. A longitudinal motor axis 20 of the first motor 14 and a longitudinal opening axis 24 of the first opening 18 appear projected in Fig. 3.

[0077] A first gearbox 16, which is designed as a two-stage spur gear, is coupled to the first motor 14. A gear 29 of the first gearbox 16 is coupled to a pinion of a motor shaft 23 of the first motor 14, and a toothed large gear wheel 30 of the first gearbox 16 is coupled to the gear 29. Longitudinal axes of the gear 29 and of the large gear wheel 30 are aligned parallel to the longitudinal axis 20 of the motor. The first gearbox 16 is connected to the first longitudinal member 2 via a first gearbox housing, which is not shown in Fig. 3, by means of an elastic three-point bearing, as described by way of example in connection with Fig. 1 and Fig. 2.

[0078] As a result, the first motor 14, which is connected to the first gear housing via a motor housing which does not have its own motor bearings, is arranged immovably in the first opening 18.

[0079] The first motor 14 and the first transmission 16 are arranged in a side section of the support structure 1, which borders on the central section of the support structure 1. A cardan shaft 31, as shown by way of example in Fig. 5 and whose cardan shaft longitudinal axis is aligned parallel to the motor longitudinal axis 20, is connected to the large transmission gear 30. The cardan shaft 31 is guided below the first longitudinal member 2, in a region between the first primary spring 11 and the further primary spring, through a hollow space 32 of a first wheel 8 of the chassis, as shown by way of example in Fig. 5, and is coupled to the first wheel 8 on a side of the first wheel 8 facing away from the first longitudinal member 2.

[0080] The bogie has a magnetic rail brake 33, which is connected to the axle bridge 10 in the region of the central section of the support structure 1. The magnetic rail brake 33 is longitudinally driven via the support structure 1. Forces from the magnetic rail brake 33 are introduced into the support structure 1.

[0081] Fig. 4 shows a plan view of a section of an exemplary third embodiment of a chassis according to the invention.

[0082] This exemplary third embodiment corresponds to the exemplary second embodiment of a chassis according to the invention, as shown in Fig. 3. Therefore, in Fig. 4, some of the same reference numerals are used as in Fig. 3.

[0083] A first motor 14 is introduced into a first opening 18 of a first longitudinal member 2 of a support structure 1 of the chassis, which first motor 14 projects on both sides from the first opening 18, as can be seen by way of example in Fig. 3.

[0084] On an outer side of the chassis, a first gear 16 designed as a two-stage spur gear is coupled to a motor shaft 23 of the first motor 14. A cardan shaft 31, as shown by way of example in Fig. 5, is coupled to a gear wheel 30 of the first gear 16. The cardan shaft 31 is guided below the first longitudinal member 2 through a cavity 32 of a first wheel 8 of the chassis, as shown by way of example in Fig. 5, and is coupled to the first wheel 8 on a side of the first wheel 8 facing away from the first longitudinal member 2.

[0085] On a side of the first motor 14 facing away from the first transmission 16, a first brake disc 21 designed as a monoblock brake disc is connected to the motor shaft 23.

[0086] The first longitudinal member 2 is arranged between the first brake disc 21 and the first wheel 8 on the one hand and the first transmission 16 on the other hand.

[0087] Fig. 5 shows a side elevation of a section of an exemplary fourth embodiment of a chassis according to the invention in a sectional view. Fig. 5 shows a front view of the chassis.

[0088] The chassis is designed as a chassis for a low-floor rail vehicle.

[0089] The running gear comprises a first wheel 8, which is designed as a rail vehicle wheel with a wheel flange and is rotatably connected to a hollow cone section of an axle bridge 10 of the running gear via a wheel bearing 34.

[0090] The chassis further comprises a first longitudinal member 2 of a support structure 1, to which a first transmission 16 is connected. The first transmission 16 is coupled to a first motor 14 for transmitting torque to the first wheel 8, as shown by way of example in Fig. 4.

[0091] The first longitudinal member 2 is a structural component of the chassis and comprises an open first profile 35 having a double-T shape. The axle bridge 10 is also a structural component having open profiles. The first longitudinal member 2 is arranged between the first transmission 16, which is arranged on an outer side of the chassis, and the first wheel 8.

[0092] A cardan shaft 31 coupled to a large transmission gear 30 of the first transmission 16 is guided below the first longitudinal member 2 through a central, continuous cavity 32 of the first wheel 8. The first transmission 16 is arranged in the region of a first end face of the first wheel 8. The cardan shaft 31 is coupled to the first wheel 8 in the region of a second end face of the first wheel 8. The first transmission 16 is coupled to the first wheel 8 via a first clutch 36 and a second clutch 37. The cardan shaft 31 is coupled to the first wheel 8 via the first clutch 36, which is designed as a multi-plate clutch and is arranged in the region of the second end face of the first wheel 8. The cardan shaft 31 is coupled to the large transmission gear 30 via the second clutch 37, which is designed as a curved tooth clutch and is arranged in the region of the first end face of the first wheel 8.

[0093] The propeller shaft 31 is designed as a trumpet-shaped hollow shaft. A grounding contact 38 of the chassis is connected to the propeller shaft 31 in the area of ​​the second end face of the first wheel 8, which grounding contact extends into a hollow section of the propeller shaft 31.

[0094] The wheel bearing 34 is arranged in the cavity 32 of the first wheel 8 and is connected to the first wheel 8. The wheel bearing 34 is arranged on the hollow cone section of the axle bridge 10, with the hollow cone section protruding through the cavity 32. The cardan shaft 31, in turn, is guided through the hollow cone section of the axle bridge 10.

[0095] The first wheel 8 is coupled to the support structure 1 via the wheel bearing 34 and the axle bridge 10. List of designations

[0096] 1 Carrying structure

[0097] 2 First longitudinal member

[0098] 3 Second longitudinal member

[0099] 4 First cross member

[0100] 5 Second cross member

[0101] 6 Longitudinal axle of the chassis

[0102] 7 Chassis transverse axle

[0103] 8 First Wheel

[0104] 9 Second wheel

[0105] 10 axle bridge

[0106] 11 First primary spring

[0107] 12 First secondary spring

[0108] 13 Second secondary spring

[0109] 14 First engine

[0110] 15 Second engine

[0111] 16 First gearbox

[0112] 17 Second gearbox

[0113] 18 First opening

[0114] 19 Second opening

[0115] 20 Engine longitudinal axis

[0116] 21 First brake disc

[0117] 22 Second brake disc

[0118] 23 Motor shaft

[0119] 24 Opening longitudinal axis

[0120] 25 First bearing bush

[0121] 26 Second bearing bush

[0122] 27 Third bearing bush

[0123] 28 car body

[0124] 29 gear

[0125] 30 Large gear wheel

[0126] 31 Cardan shaft

[0127] 32 cavity

[0128] 33 Magnetic track brake

[0129] 34 wheel bearings

[0130] 35 First profile First coupling Second coupling Earthing contact

Claims

Patent claims 1. Running gear for a rail vehicle with a support structure (1) which has at least a first longitudinal member (2) and a second longitudinal member (3) as well as at least one first cross member (4) and to which at least a first wheel (8) and a second wheel (9) are rotatably connected, as well as with at least a first motor (14) and at least one first gear (16) coupled to the at least first motor (14), which are coupled to at least the first wheel (8) for torque transmission, characterized in that the at least first motor (14) is introduced into a first opening (18) of the first longitudinal member (2), wherein a pair of loose wheels is formed from the first wheel (8) and the second wheel (9).

2. Chassis according to claim 1, characterized in that the first opening (18) is arranged offset from a contact zone in which the first longitudinal member (2) and the at least first cross member (4) are connected to one another, in the direction of a chassis longitudinal axis (6).

3. Chassis according to claim 1 or 2, characterized in that the at least first gear (16) is arranged as a spur gear on an outer side of the chassis.

4. Chassis according to one of claims 1 to 3, characterized in that a cardan shaft (31) coupled to the at least first gear (16) is guided through a central, continuous cavity (32) of the first wheel (8), wherein the at least first gear (16) is arranged in the region of a first end face of the first wheel (8) and the cardan shaft (31) is coupled to the first wheel (8) in the region of a second end face of the first wheel (8).

5. Chassis according to claim 4, characterized in that the at least first transmission (16) has at least one first Clutch (36), preferably via a first clutch (36), via which the cardan shaft (31) is coupled to the first wheel (8), and via a second clutch (37), via which the cardan shaft (31) is coupled to the at least first transmission (16) is coupled to the first wheel (8).

6. Chassis according to claim 4 or 5, characterized in that a wheel bearing (34) is arranged in the cavity (32) and is connected to the first wheel (8), wherein the first wheel (8) is coupled to the support structure (1) via the wheel bearing (34).

7. Chassis according to one of claims 1 to 6, characterized in that the at least first transmission (16) is connected to the support structure (1) via a transmission bearing, wherein the at least first motor (14) is carried by means of the at least first transmission (16).

8. Chassis according to one of claims 1 to 6, characterized in that the at least first gear (16) is supported on a shaft connected to the first wheel (8) and is connected to the support structure (1) via a torque support, wherein the at least first motor (14) is carried by means of the at least first gear (16).

9. Chassis according to one of claims 1 to 8, characterized in that on a side of the at least first motor (14) facing away from the at least first transmission (16), a first brake disc (21) is connected to a motor shaft (23) of the at least first motor (14).

10. Chassis according to one of claims 1 to 9, characterized in that a longitudinal motor axis (20) is aligned parallel or approximately parallel to a chassis transverse axis (7).

11. Chassis according to one of claims 1 to 10, characterized in that structural components of the chassis comprise at least one open first profile (35).

12. Chassis according to one of claims 1 to 11, characterized in that a free chassis area for a lowered vehicle floor for a low-floor rail vehicle is formed between the first wheel (8) and the second wheel (9).

13. Chassis according to one of claims 1 to 12, characterized in that the first wheel (8) and the second wheel (9) are arranged in a region between the first longitudinal member (2) and the second longitudinal member (3).

14. Chassis according to one of claims 1 to 13, characterized in that a spring device is connected to the support structure (1), wherein the first wheel (8) and the second wheel (9) are connected to the support structure (1) via an axle bridge (10) and a primary spring arrangement of the spring device, and a secondary spring arrangement of the spring device is connected to the support structure (1) on the outside of the chassis.

15. Rail vehicle with at least one chassis according to one of claims 1 to 14.

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