SINGLE AXLE DRIVE AND RAIL VEHICLE

Description

[0001] A single-axle drive and a rail vehicle with such a single-axle drive are specified.

[0002] Single-axle drives for rail vehicles typically consist of a motor and a transmission. The transmission's large gear can be attached to a rail vehicle's axle box bearing. The motor and transmission are each housed in a separate housing.

[0003] Single-axle drives are particularly suitable for driving rail vehicles. The motor of the single-axle drive is an electric motor. This is connected to a wheel of the rail vehicle via the gearbox. During operation, the motor's rotational movement is transmitted to the wheel via the gearbox.

[0004] In particular, single-axle drives are used in rail vehicles such as trams or subways.

[0005] Patent application EP 2918471 describes a single-axle drive for a rail vehicle comprising a motor housing and a transmission housing. A connection of two transmission housing parts via a detachable flange connection in a connecting plane in which a longitudinal axis of a wheel set shaft enclosed by the housing parts lies is also known from patent application EP 0 571 961 A1 and utility model DE 68 12 453 U.

[0006] One task to be solved is to specify a single-axis drive that can be operated efficiently.

[0007] This object is achieved with a single-axle drive according to claim 1.

[0008] The single-axle drive comprises a motor, a two-stage transmission connected to the motor, which has a pinion, an intermediate shaft and a large gear, wherein the pinion and the intermediate shaft form a first gear stage and the intermediate shaft and the large gear form a second gear stage, a first housing, and a second housing, wherein the motor and the pinion are arranged in the first housing, the large gear is arranged in the second housing, the intermediate shaft is arranged in the first housing, and the pinion and a rotor of the motor are arranged on a motor shaft.

[0009] The motor of the single-axle drive is an electric motor. Thus, the motor has a stator and a rotor that is movably mounted to the stator. The rotor is arranged on the motor shaft. The transmission has two gear stages. The first gear stage is formed by the pinion and the intermediate shaft. The second gear stage is formed by the intermediate shaft and the large gear. The pinion and the large gear are in particular gears. A gear is also arranged on the intermediate shaft. The motor and the pinion are in particular arranged entirely in the first housing. Thus, the motor and the pinion are arranged in a common housing. The large gear is arranged entirely in the second housing.

[0010] The fact that the pinion and rotor are arranged on the motor shaft means that the pinion and rotor are mounted together. The pinion and rotor are connected to each other via the motor shaft. Thus, the pinion and rotor form a single component with the motor shaft.

[0011] The single-axle drive has the advantage of eliminating the need for a coupling between the motor and the gearbox. The rotor and pinion are both mounted on the motor shaft. Thus, the rotor's movement is transferred directly to the pinion. Since no coupling is required, the single-axle drive's overall design is particularly compact. It also saves at least 10% of the total weight. Furthermore, manufacturing, assembly, and maintenance costs are reduced.

[0012] Because the motor and part of the gearbox are arranged in a common housing, namely the first housing, the motor can be removed from the single-axis drive more easily. For example, the rotor bearings are completely contained in the first housing. This means that the motor shaft in particular is completely contained in the first housing. When removing the motor from the single-axis drive, it is therefore not necessary to support the rotor, as the rotor centering is retained. Furthermore, the motor can be easily tested and checked even when removed. Advantageously, no test adapter is required for this. Furthermore, there is no risk of contamination when removing the motor, as the motor remains a closed unit in the first housing during removal. Avoiding contamination of the rotor is particularly advantageous with rotors with permanent magnets.

[0013] Because the motor and part of the transmission are both located in the first housing, the single-axle drive can be manufactured with greater precision. This advantageously enables smoother running.

[0014] The first housing and the second housing are connected to each other in a reversibly detachable manner. For example, the first housing and the second housing are connected to each other in a reversibly detachable manner using screws. This means that the first housing and the second housing can be separated and reconnected without damaging them. This allows for particularly easy removal of the first housing and the motor.

[0015] According to at least one embodiment of the single-axle drive, the first housing and the second housing are connected to each other via a flange connection. A flange connection enables a stable and tight connection between the first housing and the second housing.

[0016] According to at least one embodiment of the single-axle drive, the single-axle drive is designed to be used in a rail vehicle.

[0017] The first housing completely surrounds the motor, protecting it from environmental influences.

[0018] According to at least one embodiment of the single-axle drive, the first housing has an opening toward the second housing. The first housing is connected to the second housing via the opening.

[0019] According to at least one embodiment of the single-axle drive, the second housing has an opening facing the first housing. The second housing is connected to the first housing via the opening.

[0020] A rail vehicle is also specified, which includes the single-axle drive and a vehicle vertical axle. In particular, the rail vehicle can have multiple single-axle drives.

[0021] According to at least one embodiment of the rail vehicle, the parting plane between the first housing and the second housing forms an angle other than zero degrees with the vertical axis of the rail vehicle. In this case, the intermediate shaft is arranged in the first housing. The first housing with the motor can thus be easily removed from the rail vehicle.

[0022] According to at least one embodiment of the rail vehicle, the parting plane between the first housing and the second housing forms an angle of zero degrees with the vertical axis of the rail vehicle. In this case, the intermediate shaft is arranged in the second housing. In this case, the first housing with the motor can be easily removed from the rail vehicle.

[0023] According to at least one embodiment of the rail vehicle, the motor shaft runs parallel to a wheelset shaft. Thus, the motor can be arranged next to the wheelset shaft to save space.

[0024] According to at least one embodiment of the rail vehicle, the second housing is attached to a wheelset shaft of a wheelset.

[0025] The above-mentioned properties, features and advantages of the invention and the manner in which they are achieved are further explained by the following description of the embodiments of the invention in conjunction with the corresponding figures, wherein Figure 1 a single-axis drive according to an embodiment, the Figures 2 and 3 the single-axle drive in the open state, Figure 4 a schematic cross-section through the embodiment of the single-axle drive, Figure 5 a single-axis drive according to a further embodiment, and Figure 6 show a rail vehicle according to an embodiment.

[0026] In Figure 12 shows a single-axle drive 20 according to one exemplary embodiment. The single-axle drive 20 has a motor 21. The motor 21 is an electric motor having a stator 31 and a rotor 32. The rotor 32 is arranged on a motor shaft 28. The single-axle drive 20 further has a gearbox 22 connected to the motor 21. The motor 21 and part of the gearbox 22 are arranged in a first housing 26. The first housing 26 completely surrounds the motor 21. The gearbox 22 has a large gear 25, which is arranged in a second housing 27. The large gear 25 is arranged on a hollow shaft 30.

[0027] The first housing 26 and the second housing 27 are reversibly detachably connected to each other. For this purpose, the first housing 26 and the second housing 27 are connected to each other via a flange connection. The first housing 26 and the second housing 27 are screwed together via the flange connection. This means that the first housing 26 and the second housing 27 are connected to each other using screws 33.

[0028] The flange connection forms a parting plane between the first housing 26 and the second housing 27. This means that the first housing 26 and the second housing 27 are connected to each other at the parting plane. The single-axle drive 20 can be used in a rail vehicle 34. The rail vehicle 34 is, for example, a tram or a subway. The single-axle drive 20 can be attached to a wheelset shaft 35 of a wheelset of the rail vehicle 34. For example, the hollow shaft 30 is connected to the wheelset shaft 35 of the wheelset. The wheelset shaft 35 can be located inside the hollow shaft 30. Thus, the second housing 27 is attached to the wheelset shaft 35 of the wheelset. In this case, the motor shaft 28 runs parallel to the wheelset shaft 35.

[0029] Since only the second housing 27 is directly attached to the wheelset shaft 35, but not the first housing 26, the installation, removal, and handling of the wheelset shaft 35 are simplified. The first housing 26 is attached to a bogie of the rail vehicle 34.

[0030] When the single-axle drive 20 is installed in the rail vehicle 34, the vehicle vertical axis h runs parallel to the Figure 1 shown vertical direction z. The parting plane between the first housing 26 and the second housing 27 encloses an angle, which is different from 0°, with the vehicle vertical axis h of the rail vehicle 34. For example, the angle between the parting plane and the vehicle vertical axis h is at least 10°.

[0031] In Figure 2 is the embodiment of the single-axis drive 20 from Figure 1shown. The first housing 26 and the second housing 27 are separated from each other. This is possible by removing the screws 33 between the first housing 26 and the second housing 27.

[0032] The gear 22 has a pinion 23, an intermediate shaft 24, and the large gear 25. The motor 21, the pinion 23, and the intermediate shaft 24 are arranged in the first housing 26. The pinion 23 and the rotor 32 of the motor 21 are arranged on the motor shaft 28. This means that the motor shaft 28 forms a common shaft for the rotor 32 and the pinion 23.

[0033] The transmission 22 has two gear stages. The first gear stage is formed by the pinion 23 and the intermediate shaft 24. Thus, the pinion 23 and the intermediate shaft 24 are arranged side by side in the first housing 26. The intermediate shaft 24 is arranged between the pinion 23 and the large gear 25. The second gear stage is formed by the intermediate shaft 24 and the large gear 25. The large gear 25 is arranged in the second housing 27.

[0034] The first housing 26 has an opening 29 toward the second housing 27. Furthermore, the second housing 27 has an opening 29 toward the first housing 26. Thus, the second gear stage can be formed by the gear of the intermediate shaft 24 and the large gear 25 meshing in the region of the openings 29.

[0035] In Figure 3 is also the embodiment of the single-axis drive 20 from Figure 2The single-axis drive 20 is shown from a different direction, so that the interior of the second housing 27 is shown.

[0036] The large gear 25 of the transmission 22 is arranged on the hollow shaft 30. The diameter of the large gear 25 is larger than the diameter of the pinion 23. The rotation of the rotor 32 can be transmitted to a wheel of a rail vehicle 34 via the motor 21 and the transmission 22. Thus, the single-axle drive 20 can be used to drive a rail vehicle 34. The single-axle drive 20 is arranged on the inside of the wheel.

[0037] By loosening the screws 33 between the first housing 26 and the second housing 27, the single-axle drive 20 can be removed from the rail vehicle 34. This separates the first housing 26 and the second housing 27 in the second gear stage of the transmission 22. During the separation, the large gear 25 with its bearings remains in the second housing 27, and the intermediate shaft 24 remains in the first housing 26.

[0038] The center of the second gear stage is defined by the connecting axis through the center of the hollow shaft 30 and the intermediate shaft 24. This center forms an angle of 90° with the parting plane between the first housing 26 and the second housing 27. This allows the first housing 26 to be separated from the second housing 27 and the first housing 26 to be removed from the single-axle drive 20. The first housing 26 with the motor 21 can be removed downwards from the rail vehicle 34 in a vertical direction z. This is advantageous because the motor 21 is usually arranged at the lowest position in the rail vehicle 34 and can therefore be easily removed. Furthermore, no lateral displacement of the first housing 26 is necessary to remove the first housing 26 with the motor 21.

[0039] In Figure 4 is a schematic cross section through the single-axis drive 20 according to the embodiment of Figure 1shown. A cross section through the first housing 26 is shown.

[0040] The motor 21 and the pinion 23 are arranged in the first housing 26. The motor 21 has the stator 31 and the rotor 32. The stator 31 extends around the rotor 32. Thus, the rotor 32 is arranged in the stator 31. The rotor 32 is arranged on the motor shaft 28. The pinion 23 is also arranged on the motor shaft 28. Thus, the pinion 23 and the rotor 32 are connected to each other via the motor shaft 28 and form a single component.

[0041] In Figure 5 a single-axis drive 20 according to a further embodiment is shown. In contrast to the Figures 1 to 3 In the embodiment shown, the intermediate shaft 24 is in Figure 5 arranged in the second housing 27.

[0042] Thus, the separation of the first housing 26 from the second housing 27 takes place in the first gear stage of the transmission 22.

[0043] The center of the first gear stage is defined by the connecting axis through the centers of the intermediate shaft 24 and the motor shaft 28. This center forms an angle of 90° with the parting plane between the first housing 26 and the second housing 27. Furthermore, the parting plane between the first housing 26 and the second housing 27 forms an angle of 0° with the vertical axis h of the rail vehicle 34. The parting plane thus runs parallel to the vertical direction z. This enables the first housing 26 to be separated from the second housing 27 and the first housing 26 to be removed from the single-axle drive 20. The first housing 26 with the motor 21 can be removed downwards from the rail vehicle 34 in a vertical direction z.

[0044] In Figure 6An embodiment of a rail vehicle 34 is shown. The rail vehicle 34 comprises one or more single-axle drives 20. The single-axle drives 20 can be the ones shown in the Figures 1 to 5 shown embodiments of the single-axis drive 20.

[0045] Although the invention has been illustrated and described in detail using exemplary embodiments, the invention is not limited to the disclosed embodiments and the specific feature combinations explained therein. Further variations of the invention may be obtained by one skilled in the art without departing from the scope of the appended claims. List of reference symbols

[0046] 20:Single axle drive 21:Motor 22:Gearbox 23:Pinion 24:Intermediate shaft 25:Large gear 26:First housing 27:Second housing 28:Motor shaft 29:Opening 30:Hollow shaft 31:Stator 32:Rotor 33:Screw 34:Rail vehicle 35:Wheelset axle h:Vehicle vertical axis z:Vertical direction

Claims

1. Single-axle drive (20), comprising: - a motor (21), - a two-stage transmission (22) connected to the motor (21), which has a pinion (23), an intermediate shaft (24) and a gear wheel (25), wherein the pinion (23) and the intermediate shaft (24) form a first transmission stage and the intermediate shaft (24) and the gear wheel (25) form a second transmission stage, - a first housing (26), and - a second housing (27), wherein - the pinion (23) and a rotor (32) of the motor (21) are arranged on a motor shaft (28), - the motor (21) is arranged in the first housing (26), and - the gear wheel (25) is arranged in the second housing (27), characterised in that - the pinion (23) and the intermediate shaft (24) are arranged in the first housing (26), and - the first housing (26) and the second housing (27) are connected to one another in a reversibly detachable manner.

2. Single-axle drive (20) according to one of the preceding claims, in which the first housing (26) and the second housing (27) are connected to one another by way of a flange connection.

3. Single-axle drive (20) according to one of the preceding claims, which is designed to be used in a rail vehicle (34).

4. Single-axle drive (20) according to one of the preceding claims, in which the first housing (26) has an opening (29) in the direction of the second housing (27).

5. Single-axle drive (20) according to one of the preceding claims, in which the second housing (27) has an opening (29) in the direction of the first housing (26).

6. Rail vehicle (34) comprising a vehicle vertical axis (h) and the single-axle drive (20) according to one of the preceding claims.

7. Rail vehicle (34) according to claim 6, in which the separation plane between the first housing (26) and the second housing (27) encloses an angle that differs from zero degrees with the vehicle vertical axis (h) of the rail vehicle (34).

8. Rail vehicle (34) according to claim 6, in which the separation plane between the first housing (26) and the second housing (27) encloses an angle of zero degrees with the vehicle vertical axis (h) of the rail vehicle (34).

9. Rail vehicle according to one of claims 6 to 8, in which the motor shaft (28) runs parallel to a wheelset shaft (35).

10. Rail vehicle according to one of claims 6 to 9, in which the second housing (27) is fastened to a wheelset shaft (35) of a wheelset.