Running gear having a support arm, and rail vehicle having such running gear

Abstract

The invention relates to running gear (3) for a rail vehicle (1), comprising a running gear frame (4), a driven wheel set (5) and a drive unit which has a traction motor (6) and / or a transmission (7) and which is coupled to the individual wheel or the wheel set (5) in order to transmit a torque, and a support arm (9, 9') for transmitting force between a housing (8) of the drive unit and the running gear frame (4). The support arm (9, 9') is connected in each case in an articulated manner to the housing (8) and to the running gear frame (4). The support arm (9, 9') is connected to the housing (8) by a housing-side spherical bearing (10), which has a bearing shell (11) and a joint pin (12) rotatably mounted in the bearing shell (11). According to the invention, a bearing block (13) which protrudes from a housing surface and has a receiving bore (14) is integrally formed on the housing (8), in which receiving bore (14) the bearing shell (11) of the housing-side spherical bearing (10) is fixed and from which a fastening section (15) of the joint pin (12) of the housing-side spherical bearing (10) projects on each of the two sides. The support arm (9, 9') forks into two housing-side partial arms (16, 16'), wherein the housing-side partial arms (16, 16') engage around the bearing block (13) and are fixed to the fastening sections (15) of the joint pin (12) of the housing-side spherical bearing (10). As a result, the connection of the support arm (9, 9') to highly loaded components, such as the housing (8) of the drive unit, can be optimised in terms of strength. In addition, this results in greater freedom of design for the drive housing in the region of the support arm connection, even when little installation space is available.

Description

[0001] Description

[0002] Running gear with a support arm and rail vehicle with such a running gear

[0003] The invention relates to a running gear for a rail vehicle according to the preamble of claim 1. The invention further relates to a rail vehicle with such a running gear.

[0004] Such a running gear comprises a chassis frame, a driven single wheel or a driven wheelset, and a drive unit containing a traction motor and / or a gearbox, which is coupled to the single wheel or wheelset for transmitting torque. Furthermore, such a running gear includes a support arm for power transmission between a housing of the drive unit and the chassis frame. The support arm is articulated to both the housing and the chassis frame. The support arm is connected to the housing by a housing-side spheroidal bearing, which has a bearing shell and a pivot pin rotatably mounted in the bearing shell. The support arm serves as a torque arm to absorb a differential torque between the input and output shafts in the running gear and to transmit it to the chassis frame.

[0005] German patent application DE 2925 836 A discloses a drive device for an electric traction vehicle with a traction motor and an axle shaft for the driving wheels rotatably mounted in a bogie. A gearbox is rotatably supported on the axle shaft by bearings. A large gear of the gearbox is connected to the axle shaft, and a pinion of the gearbox is connected to the drive end of the traction motor shaft via a torsionally flexible coupling. A spherical bearing is rotatably mounted in an outwardly projecting, fork-shaped extension of the gearbox and is connected to a mounting arm of the bogie via a torque arm. The spherical bearing comprises an elastic rubber layer formed as a spherical ring and mounted on an inner body. The inner body is made of metal and is provided with two aligned axes that serve to support the spherical bearing in the fork-shaped extension of the gearbox housing.An outer ring of the spheroidal bearing is provided with a mounting rod that serves as a torque support.

[0006] Patent DE 43 04 959 C1 discloses a rail vehicle with individually suspended, driven and / or braked wheels, each steerable about a pivot axis. The pivot axis of the wheel is tilted from its position for the freely rolling wheel by the torque support force of a drive and / or brake unit, acting as an auxiliary force. Under driving forces, the torque support force is tilted into a leading position, and under braking forces, into a trailing position. The torque support force of the drive and / or brake unit, used to change the position of the wheel's pivot axis, is simultaneously used for steering torque compensation. A torque support is arranged between the drive and / or brake unit and a chassis frame that does not perform steering movements about the pivot axis or tilting movements in the longitudinal direction of the vehicle. The torque support is torsionally rigidly connected to the wheel axle and extends through an opening in the wheel carrier towards the chassis frame.

[0007] Patent EP 2 697 108 B1 discloses a bogie for a railway vehicle comprising a bogie frame with at least one wheelset. Each wheelset has a wheelset axle with two wheels and a wheelset gearbox with a gearbox housing. The bogie further comprises a torque arm for articulated support of the wheelset gearbox on the bogie frame. The torque arm comprises a rod with a mounting knob at each end, each knob having a bearing with a cylindrical bolt. The bolts serve to support the torque arm on the gearbox housing and the bogie frame. Each bearing has a bushing arranged radially between the bolt and the mounting knob, and supported on the mounting knob by at least one further bearing element. The bushings have a bulbous section on their outer circumference, resembling a spherical cap.The bolts have a circular cross-sectional shape, at least in the area where they are supported in the bearing. The bolts can be connected to the gearbox housing and the bogie frame by means of a press fit.

[0008] The interface between the torque arm and the housing is disadvantageous when using known, bone-shaped torque arms, because to provide housing-side mounting points for the spherical bearing bolt, the housing wall must have a material profile with abrupt geometric changes in order to encompass the bone-shaped end of the torque arm. This not only restricts the design freedom for connecting the torque arm, but also leads to problems in the strength calculation for the housing in highly stressed applications, especially when there are additional limitations regarding the installation space available in the drive unit. The invention is therefore based on the objective of providing a drive unit of the type mentioned above that overcomes the problems described.

[0009] A generic running gear for a rail vehicle can be, for example, the bogie of a locomotive, a multiple unit for regional or high-speed transport, or a tram or subway. The running gear comprises a frame, which may, for example, have two longitudinal beams connected by one or more crossbeams. The running gear also includes one or more driven wheels or one or more driven wheelsets, each with two wheel discs rigidly connected to each other via a wheelset axle. In addition, the running gear may also include undriven wheels or wheelsets. The wheelsets are rotatably mounted in axle bearings, on which the running gear frame is primarily sprung. The running gear also includes a drive unit, which is coupled to the wheel or wheelset to transmit torque.The drive unit can comprise a traction motor, a gearbox, or both. A drive unit housing can therefore be designed as a motor housing, a gearbox housing, or a combined motor-gearbox housing. The drive unit can also include a coupling for transmitting torque from a motor shaft to a gearbox shaft or directly from the motor shaft to the wheelset axle. For power transmission between a drive unit housing and the running gear frame, the running gear also has one or more support arms. Each support arm is pivotally connected to both the housing and the running gear frame, with the support arm being connected to the housing by a spherical bearing on the housing side. The spherical bearing comprises a bearing shell and a pivot pin rotatably mounted within the bearing shell.

[0010] According to the invention, a bearing block with a receiving bore is integrally formed on the housing, projecting from a housing surface. The bearing shell of the housing-side spherical bearing is fixed in this bore, and a mounting section of the pivot pin of the housing-side spherical bearing protrudes from each side of the bore. The support arm forks into two housing-side sub-arms. These two housing-side sub-arms extend from an unforked arm section of the support arm facing the chassis frame to the housing of the drive unit. The housing-side sub-arms encompass the bearing block and are fixed to the mounting sections of the pivot pin of the housing-side spherical bearing.By simplifying the housing-side interface to a simple bearing block in which the spherical bearing is fixed, abrupt changes in the housing wall geometry can be avoided, ensuring sufficient housing strength through a smooth material flow. This allows for optimized strength at the connection of the support arm to highly stressed components, such as the drive unit housing. Furthermore, by not fixing the spherical bearing within the support arm, greater design freedom is gained for the drive housing in the area of ​​the support arm connection, even in confined spaces.

[0011] In an advantageous embodiment of the drive according to the invention, the support arm has a longitudinal axis along which the support arm comprises an unforked arm section and subsequently a first forked arm section formed by the housing-side partial arms. The unforked arm section is shorter than, preferably half as long as, the first forked arm section. The greater length of the first forked arm section creates a long gap between the housing-side partial arms, which can be used to shape the housing wall to ensure a uniform material flow.

[0012] In a further advantageous embodiment of the drive according to the invention, the clear width between the housing-side partial arms is at least 40% of the section length of the first forked arm section. This minimum width between the housing-side partial arms also optimizes the space between them, thus further increasing the design freedom of the housing wall in this area for smoothing the material flow.

[0013] In a further advantageous embodiment of the drive according to the invention, the housing-side sub-arms each have a rectangular cross-section, the side lengths of which are at least 36% of the clear width between the housing-side sub-arms. A support arm with housing-side sub-arms having a rectangular cross-section can be easily manufactured as a casting or forging, the edges of which are preferably rounded. The rectangular cross-section of the housing-side sub-arms can thus have rounded corners. In particular, one side of the cross-section can be larger than the other, for example by about 10%. In this way, the support arm offers a large gap between the housing-side sub-arms and simultaneously sufficient tensile and compressive strength to fulfill its power transmission function.

[0014] In a further advantageous embodiment of the drive according to the invention, the

[0015] The support arm is connected to the running gear frame by a frame-side spherical bearing, which has a bearing shell and a pivot pin rotatably mounted within the bearing shell. The bearing shell of the frame-side spherical bearing is fixed in a bearing bore that extends through the unforked section of the arm, from which a mounting section of the pivot pin protrudes on each side. The pivot pin is coupled to the running gear frame via connecting elements attached to the mounting sections. This conventional method of connecting the support arm to the running gear frame is suitable when sufficient installation space is available for the frame-side interface and when lower requirements exist regarding material flow and strength at the running gear frame.

[0016] In an alternative embodiment of the drive according to the invention, the support arm is connected to the drive frame by a frame-side spherical bearing, which has a bearing shell and a pivot pin rotatably mounted in the bearing shell. A bearing lug with a receiving bore is arranged on the drive frame, in which the bearing shell of the frame-side spherical bearing is fixed and from which a mounting section of the pivot pin protrudes on each side. The support arm forks into two frame-side sub-arms, which encompass the bearing lug and are attached to the mounting sections of the pivot pin of the frame-side spherical bearing. The alternative embodiment is thus doubly forked, with a central, unforked arm section branching towards the housing into the two housing-side sub-arms and oppositely towards the drive frame into the two frame-side sub-arms.In this embodiment, the frame-side support arms encompass the bearing lug, thus simplifying the frame-side interface. A simple bearing lug, in which the spherical bearing is fixed, also prevents abrupt changes in the geometry of the undercarriage frame, ensuring sufficient strength with a smooth material flow. This allows for optimized strength at the connection of the support arm to highly stressed components, such as a beam of the undercarriage frame. By not fixing the spherical bearing within the support arm, greater design freedom for the undercarriage frame is gained in the area of ​​the support arm connection, even in confined spaces.

[0017] In a further advantageous embodiment of the drive according to the invention, the support arm has a longitudinal axis along which the support arm comprises an unforked arm section and, adjoining this, a first forked arm section formed by the housing-side partial arms, and, opposite this, a second forked arm section formed by the frame-side partial arms. The first forked arm section and / or the second forked arm section is longer than, preferably two and a half times as long as, the unforked arm section.Due to the large section lengths of the first forked arm section and / or the second forked arm section compared to the unforked arm section, long gaps are formed between the housing-side partial arms and also between the frame-side partial arms, which can be used for the design of the housing wall or the drive frame with regard to a uniform material flow.

[0018] In a further advantageous embodiment of the drive according to the invention, the clear width between the housing-side partial arms is at least 80% of the length of the first forked arm section and / or the clear width between the frame-side partial arms is at least 80% of the length of the second forked arm section. These minimum widths between the housing-side partial arms and between the frame-side partial arms also optimize the space between the housing-side partial arms and the space between the frame-side partial arms with respect to their width, thus further increasing the design freedom of the housing wall and the drive frame in these areas for smoother material flow.

[0019] In a further advantageous embodiment of the drive according to the invention, the housing-side and frame-side sub-arms each have a rectangular cross-section, the side lengths of which are at least 50% of the clear width. A support arm with housing-side and frame-side sub-arms having rectangular cross-sections can be easily manufactured as a casting or forging, the edges of which are preferably rounded. The rectangular cross-section of the housing-side and frame-side sub-arms can thus have rounded corners. In particular, the side lengths of the cross-section can be of equal size. In this way, the support arm offers a large gap between the housing-side and frame-side sub-arms, while simultaneously providing sufficient tensile and compressive strength to fulfill its power transmission function.

[0020] In a further advantageous embodiment of the drive according to the invention, the housing-side partial arms span a first arm plane and the frame-side partial arms span a second arm plane. The first arm plane and the second arm plane can coincide, so that the support arm has an H or X shape. However, the first arm plane and the second arm plane can also be arranged rotated relative to each other with respect to a longitudinal axis of the support arm, for example by 90° or another angle – depending on the connection situation available on the housing and on the drive frame for the support arm.

[0021] In a further advantageous embodiment of the drive according to the invention, an end face is formed on a free end of a housing-side sub-arm and / or a frame-side sub-arm, into which a threaded blind hole extends parallel to the longitudinal axis of the support arm. A fastening section of the pivot bolt has a through-hole that runs coaxially to the threaded blind hole. A sub-arm of the support arm is fixed to a fastening section of a pivot bolt by means of a screw bolt that passes through the through-hole of the fastening section and is screwed into the threaded blind hole of the sub-arm. The tensile and compressive forces transmitted by the support arm thus advantageously act in the direction of a screw axis of the screw bolt. A fastening section can have two opposing parallel bearing surfaces between which the through-hole extends.On one support surface rests the end face of a partial arm, on the other support surface rests a screw head molded onto the end of the screw bolt, possibly with a locking agent in between.

[0022] Further properties and advantages will become apparent from the following description of two specific embodiments of the invention with reference to the drawings, in which

[0023] FIG 1 a rail vehicle with running gear in side view,

[0024] FIG 2 shows a perspective view of a first embodiment of a support arm according to the invention,

[0025] FIG 3 shows a front view of the support arm from FIG 2 with partial section,

[0026] FIG 4 shows a bottom view of the support arm from FIG 2

[0027] FIG 5 shows a perspective view of the connection of the support arm from FIG 2 to a housing,

[0028] FIG 6 shows a perspective view of a second embodiment of a support arm according to the invention,

[0029] FIG 7 shows a front view of the support arm from FIG 6 in full section,

[0030] FIG 8 shows a side view of the support arm from FIG 6 and

[0031] FIG 9 schematically illustrates a perspective view of the connection of the support arm from FIG 6 to a housing and to a drive frame.

[0032] According to FIG. 1, a rail vehicle 1 according to the invention comprises a car body 2, which is supported on, for example, two bogies 3 according to the invention. The rail vehicle 1 is shown as a locomotive, but it could also be a multiple unit train for regional or high-speed transport, a tram, or a metro. The bogies 3 are designed as bogies so that they can rotate under the car body 2 about a vertical axis. A bogie 3 comprises a bogie frame 4, which may, for example, have two longitudinal beams connected to each other by one or more crossbeams. The bogie 3 comprises two driven wheelsets 5, each having two wheel discs rigidly connected to each other via a wheelset axle. The bogie could also have driven individual wheels. The wheelsets 5 are rotatably mounted in wheelset bearings, on which the bogie frame 4 is supported by primary spring suspension.The running gear 3 further comprises two drive units, each coupled to a wheelset 5 for transmitting drive torque. The drive unit can include a traction motor 6, a gearbox 7, or both. A housing 8 of the drive unit can therefore be designed as a motor housing, a gearbox housing, or a combined motor-gearbox housing. The drive unit can also include a coupling for transmitting torque from a motor shaft to a gearbox shaft or from the motor shaft directly to the wheelset shaft.

[0033] For power transmission between a housing 8 of the drive unit and the running gear frame 4, the running gear 3 further comprises one or more support arms 9 as shown in FIGS. 2 to 9. As shown in FIGS. 5 and 9, a support arm 9 is pivotally connected to both the housing 8 and the running gear frame 4, the support arm 9 being connected to the housing 8 by a housing-side spherical bearing 10. The housing-side spherical bearing 10 comprises a bearing shell 11 and a pivot pin 12 rotatably mounted in the bearing shell 11.

[0034] A bearing block 13, projecting from a housing surface, is integrally formed on the housing 8. The bearing shell 11 of the housing-side spherical bearing 10 is fixed in this bore, and a mounting section 15 of the pivot pin 12 protrudes from each side of the bore. The support arm 9 forks into two housing-side sub-arms 16. These two housing-side sub-arms 16 extend from an unforked arm section 9A of the support arm 9, facing the running gear frame 4, towards the housing 8 of the drive unit. The housing-side sub-arms 16 encompass the bearing block 13 and are fixed to the mounting sections 15 of the pivot pin 12.By simplifying the housing-side interface to a simple bearing block 13, in which the housing-side spherical bearing 10 is fixed, abrupt changes in the housing wall geometry can be avoided, thus ensuring sufficient housing 8 strength with a smooth material flow. This allows the connection of the support arm 9 to highly stressed components, such as the housing 8 of the drive unit, to be optimized in terms of strength. Since the spherical bearing 10 is not fixed within the support arm 9 itself, greater design freedom for the drive housing 8 in the area of ​​the support arm connection is gained, even in confined spaces.

[0035] According to FIGS. 2 to FIGS. 5, the support arm 9 has a longitudinal axis 9L along which the support arm 9 comprises an unforked arm section 9A and subsequently a first forked arm section 9B formed by the housing-side partial arms 16. The unforked arm section 9A is shorter than, preferably half as long as, the first forked arm section 9B. Due to the large section length LB of the first forked arm section 9B compared to the section length LA of the unforked arm section 9A, a long gap is formed between the housing-side partial arms 16, which can be used for shaping the housing wall with regard to a uniform material flow.

[0036] A clear width B between the housing-side partial arms 16 is at least 40% of the section length LA of the first forked arm section 9A. This minimum width between the housing-side partial arms 16 also optimizes the space between them with respect to its width B, thus further increasing the design freedom of the housing wall in this area for smoothing material flow.

[0037] The housing-side partial arms 16 each have a rectangular cross-section, the side lengths L16 of which are at least 36% of the clear width B between the housing-side partial arms 16. A support arm 9 with housing-side partial arms 16 having a rectangular cross-section can be easily manufactured as a casting or forging, the edges of which are preferably rounded. The rectangular cross-section of the housing-side partial arms 16 can thus have rounded corners. In particular, one side length L16a of the cross-section can be larger than the other side length L16b, for example by about 10%. In this way, the support arm 9 provides a large gap between the housing-side partial arms 16 and at the same time sufficient tensile and compressive strength to fulfill its force transmission function.

[0038] The support arm 9 is connected to the running gear frame 4 by a frame-side spherical bearing 17, which has a bearing shell 18 and a pivot pin 19 rotatably mounted in the bearing shell 18. The bearing shell 18 of the frame-side spherical bearing 17 is fixed in a bearing bore 20 that extends through the unforked arm section 9A, from which a mounting section 21 of the pivot pin 19 protrudes on each side. The pivot pin 19 is coupled to the running gear frame 4 via connecting elements (not shown) attached to the mounting sections 21. This conventional method of connecting the support arm 9 to the running gear frame 4 is suitable when sufficient installation space is available for the frame-side interface and when lower requirements exist regarding material flow and strength at the running gear frame 4.

[0039] Alternatively, the support arm 9' according to FIG. 9 is also connected to the running gear frame 4 by a frame-side spherical bearing 17, which has a bearing shell 18 and a pivot pin 19 rotatably mounted in the bearing shell 18. According to the alternative, however, a bearing lug 22 with a receiving bore 23 is arranged on the running gear frame 4, in which the bearing shell 18 of the frame-side spherical bearing 17 is fixed and from which a fastening section 21 of the pivot pin 19 protrudes on each side.

[0040] The support arm 9' forks, as shown in FIGS. 6 to FIGS. 9, into two frame-side sub-arms 24, which engage the bearing lug 22 and are attached to the mounting sections 21 of the pivot pin 19 of the frame-side spherical bearing 17. The alternative embodiment is thus doubly forked, with a central, unforked arm section 9A' branching towards the housing 4 into the two housing-side sub-arms 16' and opposite, towards the running gear frame 4, into the two frame-side sub-arms 24. In this embodiment, the frame-side sub-arms 24 engage the bearing lug 22, thereby simplifying the frame-side interface. A simple bearing lug 22, in which the frame-side spherical bearing 17 is fixed, also prevents abrupt changes in geometry on the running gear frame 4, thus ensuring sufficient strength with a smooth material flow.This allows the connection of the support arm 9' to highly stressed components, such as a beam of the running gear frame 4, to be optimized with regard to strength. By not fixing the frame-side spherical bearing 17 in the support arm 9', greater design freedom for the running gear frame 4 in the area of ​​the support arm connection is gained, even in confined spaces.

[0041] The support arm 9' has a longitudinal axis 9L' along which the support arm 9' comprises an unforked arm section 9A' and, adjoining this, a first forked arm section 9B' formed by the housing-side partial arms 16', and, opposite this, a second forked arm section 90 formed by the frame-side partial arms 24. The first forked arm section 9B' and the second forked arm section 90 are each of the same length, but longer than, preferably two and a half times as long as, the unforked arm section 9A'.Due to the large section length LB' of the first forked arm section 9B' and the large section length LG of the second forked arm section 90 compared to the section length LA' of the unforked arm section 9A', long gaps are formed between the housing-side partial arms 16' and also between the frame-side partial arms 24, which can be used for the design of the housing 8 or the drive frame 4 with regard to a uniform material flow.

[0042] A clear width B' between the housing-side sub-arms 16' is at least 80% of the section length LB' of the first forked arm section 9B', and a clear width B' between the frame-side sub-arms 24 is at least 80% of the section length LC of the second forked arm section 90. These minimum widths between the housing-side sub-arms 16' and between the frame-side sub-arms 24 also optimize the space between the housing-side sub-arms 16' and the space between the frame-side sub-arms 24 in terms of their width, thus further increasing the design freedom of the housing 8 and the drive frame 4 in these areas to even out the material flow.

[0043] The housing-side partial arms 16' and the frame-side partial arms 24 each have a rectangular cross-section, the side lengths of which L16' and L24 are at least 50% of the clear width B'. A support arm 9' with housing-side partial arms 16' and frame-side partial arms 24 having a rectangular cross-section can be easily manufactured as a casting or forging, the edges of which are preferably rounded. The rectangular cross-section of the housing-side partial arms 16' and frame-side partial arms 24 can thus have rounded corners. In particular, the side lengths L16' and L24 of the cross-section can each be of equal size. In this way, the support arm 9' provides a large gap between the housing-side partial arms 16' and a large gap between the frame-side partial arms 24, while simultaneously offering sufficient tensile and compressive strength to fulfill its force transmission function.

[0044] The housing-side partial arms 16' span a first arm plane and the frame-side partial arms 24 a second arm plane, which coincide in the illustrated embodiment, so that the support arm 9' has the H or X shape shown in FIGS. 6 to FIGS. 9. However, the first arm plane and the second arm plane can also be arranged rotated relative to each other with respect to the longitudinal axis L9' of the support arm 9', for example by 90° or another angle – depending on the connection situation available on the housing 8 and on the running gear frame 4 for the support arm 9'.

[0045] End faces 25 are formed at the free ends of the housing-side partial arms 16 and 16', and the frame-side partial arms 24. A threaded blind hole 26 extends into these end faces parallel to the longitudinal axis L9 and L9' of the support arm 9 and 9', respectively, into the partial arm 16, 16', 24. A fastening section 15 and 21 of the pivot bolt 12 and 19, respectively, has a through hole 27 that runs coaxially with the threaded blind hole 26. A partial arm 16, 16', 24 of the support arm 9 or 9' is fixed to a fastening section 15 or 21 of a hinge pin 12 or 19 by means of a screw bolt 28 which passes through the through-hole 27 of the fastening section 15 or 21 and is screwed into the threaded blind hole 26 of the partial arm 16, 16', 24. The tensile and compressive forces transmitted by the support arm 9 or 9' thus act advantageously in the direction of a screw axis of the screw bolt 28. Each fastening section 15 or 2121 has two opposing parallel bearing surfaces, between which the through hole 27 extends. On one bearing surface, the end face 25 of a partial arm 16, 16', 24 rests, and on the other bearing surface, a screw head formed at the end of the screw bolt 28 rests, optionally with the interposition of a screw locking device.

Claims

Patent claims 1. Running gear (3) for a rail vehicle (1), with - a drive frame (4), - a driven single wheel or a driven wheelset (5) and - a drive unit comprising a traction motor (6) and / or a gearbox (7) coupled to the single wheel or wheelset (5) for the transmission of torque, and - a support arm (9, 9') for power transmission between a housing (8) of the drive unit and the drive frame (4), - wherein the support arm (9, 9') is articulated to the housing (8) and to the drive frame (4), - wherein the support arm (9, 9') is connected to the housing (8) by a housing-side spheroidal bearing (10) which has a bearing shell (11) and a pivot pin (12) rotatably mounted in the bearing shell (11), characterized by - that a bearing block (13) projecting from a housing surface is formed on the housing (8) with a receiving bore (14) in which the bearing shell (11) of the housing-side spherical bearing (10) is fixed and from which a fastening section (15) of the pivot bolt (12) of the housing-side spherical bearing (10) protrudes on both sides, - that the support arm (9, 9') forks into two housing-side sub-arms (16, 16'), - wherein the housing-side partial arms (16, 16') encompass the bearing block (13) and are fixed to the fastening sections (15) of the pivot bolt (12) of the housing-side spheroidal bearing (10).

2. Drive (3) according to claim 1, - wherein the support arm (9, 9') has a longitudinal axis (L9, L9') along which the support arm (9, 9') comprises an unforked arm section (9A, 9A') and subsequently a first forked arm section (9B, 9B') formed by the housing-side partial arms (16, 16'), - wherein the unforked arm section (9A, 9A') is shorter than, preferably half as long as, the first forked arm section (9B, 9B').

3. Drive according to claim 2, - wherein a clear width (B, B') between the housing-side partial arms (16, 16') is at least 40% of a section length (LB, LB') of the first forked arm section (9B, 9B').

4. Drive (3) according to one of claims 1 to 3, - wherein the housing-side partial arms (16, 16') each have a rectangular cross-section, the side lengths (L16a, L16b, L16') of which is at least 36% of the clear width (B, B').

5. Drive (3) according to one of claims 2 to 4, - wherein the support arm (9') is connected to the running gear frame (4) by a frame-side spheroidal bearing (10) which has a bearing shell (11) and a pivot pin (12) rotatably mounted in the bearing shell (11), - wherein the bearing shell (11) of the frame-side spherical bearing (10) is in a position corresponding to the unforked arm section (9A) 1 ) is fixed in the bearing bore (20), from which a fastening section (15) of the pivot bolt (12) protrudes on both sides, and - wherein the pivot pin (12) is coupled to the running gear frame (4) via connecting means attached to the fastening sections (15).

6. Drive (3) according to claim 1 , - wherein the support arm (9') is connected to the running gear frame (4) by a frame-side spheroidal bearing (17) which has a bearing shell (18) and a pivot pin (19) rotatably mounted in the bearing shell (18), - wherein a bearing bracket (22) with a receiving bore (23) is arranged on the running gear frame (4), in which the bearing shell (18) of the frame-side spherical bearing (17) is fixed and from which a fastening section (21) of the pivot bolt (19) protrudes on both sides, - wherein the support arm (9') forks into two frame-side partial arms (24), - wherein the frame-side partial arms (24) encompass the bearing tab (22) and are attached to the fastening sections (21) of the pivot bolt (19) of the frame-side spherical bearing (17).

7. Drive (3) according to claim 6, - wherein the support arm (9') has a longitudinal axis (L9 1 ) has, along which the support arm (9') has an unforked arm section (9A) 1 ) and following each of these a first forked arm section (9B) formed by the housing-side partial arms (16, 16'). 1 ) and opposite it, a second forked arm section (90) formed by the frame-side partial arms (24), - wherein the first forked arm section (9B 1 ) and / or the second forked arm section (90) is longer than, preferably two and a half times as long as, the unforked arm section (9A) 1 ) is.

8. Drive (3) according to claim 7, - where a clear width (B 1 ) between the housing-side partial arms (16') at least 80% of the section length (LB) 1 ) of the first forked arm segment (9B 1 ) and / or a clear width (B) between the frame-side partial arms (24) is at least 80% of the section length (LC) of the second forked arm section (9C).

9. Drive (3) according to one of claims 6 to 8, - wherein the housing-side partial arms (16') and the frame-side partial arms (24) each have a rectangular cross-section, the side lengths (L16', L24) of which are at least 50% of the clear width (B 1 , B).

10. Drive (3) according to any one of claims 6 to 9, - wherein the housing-side partial arms (16') span a first arm plane and the frame-side partial arms (24) span a second arm plane, - wherein the first arm plane and the second arm plane coincide or the first arm plane and the second arm plane with respect to a longitudinal axis (L9 1 ) of the support arm (9') are arranged twisted relative to each other.

11. Drive (3) according to any one of the preceding claims, - wherein an end face (25) is formed on a free end of a housing-side partial arm (16, 16') and / or a frame-side partial arm (24), into which a threaded blind hole (26) extends parallel to the longitudinal axis (L9, L9') of the support arm (9, 9') into the partial arm (16, 16', 24), - wherein a fastening section (15, 21) has a through hole (27) which is coaxial to the threaded blind hole (26), and - wherein a partial arm (16, 16', 24) of the support arm (9, 9') is fixed to a fastening section (15, 21) of a hinge bolt (12, 19) by means of a screw bolt (28) which is passed through the through hole (27) of the fastening section (15, 21) and screwed into a threaded hole (26) of the partial arm (16, 16', 24).

12. Rail vehicle (1) with a running gear (3) according to one of the preceding claims.

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