FI72294C - AXELDRIVANORDNING FOER RAELSFORDON. - Google Patents

Description

72294 ^ Rail vehicle axle drive Axeldrivanordning for rälsfordon 5

The invention relates to a rail vehicle axle drive device for a traction wheel drive of a rail vehicle, the axle drive device comprising at least one transmission housing mounted on the drive wheel axle, comprising a drive wheel connected to the drive motor and a driven wheel attached to the axle 10.

The drive axles of rail vehicles are very expensive when no clutch rod transmission is used (e.g. steam locomotives have one).

15 However, the transmission of the clutch rod is being omitted and replaced by a structure in which the shaft is driven by a gear or a chain.

In such a conventional system, the drive axle-20 of the rail vehicle has a shaft drive device mounted around the axle, which includes a gear or chain gear inside the housing. The shaft driving the gear or chain gear is connected to the motor and the shaft used is the actual axle of the vehicle for rail travel. The assembly comprising the above-mentioned axle drive device, the train wheels necessary for running on the rails 25 and the bearing housings necessary for attaching the axle to the vehicle body is called a wheel set. The axle of the wheel set thus has three objects to be mounted: two bearing pins carrying the weight of the vehicle and to which the suspension is connected, and an axle drive device. The used wheel of the axle drive device is connected 30 generally by a shrink joint to the axle of the wheel set and there is a housing around it and the drive wheel. This housing is normally mounted on a shaft with two bearings.

Such a structure normally requires 35 precision ground necks on the axle for the drive, which are on the part of the axle between the wheels and thus remain hidden under the vehicle. When carrying out repairs, either wheel of the axle must be removed if the parts mounted on the axle of the axle drive 2 72294 1 have to be replaced. This requires removing the entire wheel set from under the heavy vehicle and is thus a very laborious and consuming operation.

5 Such a conventional structure also causes a considerable load on the shaft. Such a structure, in which the axle drive device is placed on the part of the axle between the wheels, stresses the axle with a bending moment due to its own weight as well as a blocking moment generated in the traction situation when the axle drive device is supported on the locomotive frame 10 to prevent it from rotating. This torque and the resulting force are considerably large, since the torque is equal to the torque produced by the traction force acting on the vehicle by the axle in question.

The object of the present invention is to provide a new type of axle drive device 15 for rail vehicles, which does not involve the drawbacks of previously known devices. To accomplish this, the axle drive according to the invention is characterized in that said transmission housing is arranged as a bearing and support member of one end of the axle to support the axle on a vehicle bogie or frame so that said transmission housing is mounted on said axle next to the second wheel. the opposite end is supported on the bogie or frame of the vehicle by a separate bearing housing or the like.

The shaft drive device according to the invention can replace either one or both bearing housings. In the latter case, the shaft drive can be built smaller and lighter, which is advantageous in most cases. When the transmission is handled by two shaft drive devices at both ends of the shaft, the torsional load on the shaft is substantially reduced, which advantageously affects the shaft life and dimensioning.

The use of the device according to the invention achieves several advantages over the previously known solutions. The most important advantages are e.g. the easy maintenance of the device and the fact that the axle of the vehicle becomes simpler and cheaper to manufacture. The solution according to the invention is also more economically advantageous in structure and, in addition, the loads in such a structure are lower than in conventional solutions.

ti 3 72294 1 In the following, the invention will be explained in detail with reference to the accompanying drawing.

Figure 1 schematically shows a preferred embodiment of the invention.

Figure 2 schematically shows another embodiment of the invention.

Figure 3 schematically shows a third embodiment of the invention.

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Figure 4 schematically shows a fourth embodiment of the invention.

Figure 5 schematically shows another embodiment of the structure according to the invention.

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Fig. 1 schematically shows a structure in which a wheel-drive using a shaft drive device according to the invention is connected to the bogie or frame 13 of a rail vehicle by means of springs 10 and 11. The structure according to the figure has a drive device according to the invention mounted on the shaft 6 of the drive wheels 7, comprising a transmission housing 1, which at the same time acts as a bearing housing in which the shaft 6 is mounted by means of bearings 5. Also housed in the housing 1 is a transmission drive wheel 2 rotated by a motor 12 or a power transmission device driven by the motor. From the drive wheel 2, power is transmitted to the drive wheel 3 by a power-25 transmission member 4 shown in this figure as a chain or the like. The force can also be transmitted from the driving wheel to the used wheel so that said wheels are in direct tooth contact with each other. The used wheel 3 is fixed non-rotatable with respect to the wheel axle 6 in a conventional manner. According to the invention, the axle-30 linkage device performs its actual function, in addition to the transmission, also the shaft support. The transmission housing 1 thus acts as a second bearing housing of the shaft 6 and is connected to the bogie or frame 13 of the rail vehicle by means of the suspension 11 and the means for controlling the spring movement of the wheel set, whereby the vehicle weight is transferred to the shaft 6 via the transmission housing 1. This has made the rounding of the vehicle simpler, since the second actual bearing housing has become unnecessary and one bearing neck has been formed on the axle less than before.

‘72294 1 In conventional designs, the wheel axle is supported at both ends by bearing housings and springs on a bogie or frame and the transmission is arranged on the axle by a separate axle drive between the wheels. In this embodiment, the axle 5 6 of the wheel set is supported at one end in a conventional manner on the bogie or frame 13 of the vehicle by means of springs 10 and a bearing housing 8 and bearings 9 in the housing. In this preferred embodiment of the invention according to Figure 1, the axle drive device is arranged outside the wheel 7 of the wheel set. Such an arrangement is possible because the shaft drive device 10 according to the invention is narrow, since it is an integrated structure with a conventional bearing housing. The part of the shaft 6 between the wheels 7 is completely thick and can in principle be left unmachined. The axle drive on the outside of the vehicle is excellently positioned for maintenance and repairs can be made without removing the wheels or the entire wheel set from under the vehicle 15.

Figure 2 shows another embodiment of the invention. The structure according to this figure is otherwise completely similar to that shown in figure 1, but here the second support point of the axle 6 is placed between the wheels 7. This support point consists of a bearing housing 8a between the wheels 7, next to the other wheel and bearings 9a in the bearing housing and a spring 10a with which the bearing housing 8a is supported on the vehicle bogie or frame 13. In this embodiment, the axle drive arrangement and advantages are similar to but the second bearing housing 8a is not located in a service-friendly location as described in connection with the previous embodiment. In the structure according to Figure 2, it may be possible that when servicing or repairing the bearing housing 8 and the associated equipment, one of the wheels 7 has to be removed. In some cases, however, such an investment is necessary.

Figure 3 shows the structure of a third embodiment of the invention. In this embodiment, the axle drive device is similar to the previous embodiments, but it is placed between the wheels 7. Such an arrangement of the shaft drive device 35 may be desirable in some cases, although it is not as advantageous for the maintenance of the device as the structure associated with the previous embodiments. The shaft drive according to this embodiment is in a more protected place from external damage than in the previous embodiments, although it is more difficult to maintain. The arrangement of the second bearing housing 8 of the wheel set in this embodiment is identical to the embodiment shown in Fig. 1.

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Figure 4 shows a fourth embodiment of the invention. In this embodiment, both the axle drive device with the transmission housings 1a and the bearing housing 8a are arranged between the wheels 7 of the wheel set. Such a structure may be necessary if it is desired to more effectively protect the 10 shaft drives and bearings from external knocks. However, such a structure is less favorable for maintenance and repair work than the structure shown in Fig. 1.

Figure 5 shows another embodiment of a structure according to the invention. The structure according to this figure otherwise corresponds to that shown in Fig. 1, but in this embodiment two axle drive devices are used, by means of which the axle is supported at both ends on the frame or bogie. Thus, according to the figure, a wheel set is connected to the bogie or frame 13 of a rail vehicle by means of springs 11 and 26, in which two axle drive devices according to the invention are driven. The structure has drive devices according to the invention mounted on the shaft 6, at both ends of the drive wheels 7, comprising transmission housings 1 and 21, which at the same time act as bearing housings in which the shaft 6 is mounted by means of bearings 5 and 25. The housings 1 and 21 are also provided with 25 drive wheels 2 and 22 rotated by motors 31 and 32, or by motor-driven transmission devices. From the drive wheel 2.22, power is transmitted to the wheel 3.23 driven by the transmission member 4.24. Here again, any suitable member can be used as the transmission member, such as a chain, gears or the like. 30 In addition to the transmission, the shaft drives also provide shaft support. The transmission housings 1 and 21 thus act as bearing housings for the shaft 6 and are connected to the vehicle bogie or frame 13 by means of the suspension 11 and 26 and the means for controlling the spring movement of the wheel set, whereby the vehicle weight is transferred to the shaft 6 via the transmission housings 1 and 21.

72294 1 In the embodiment according to Fig. 5, two motors 31 and 32 or a transmission device driven by the motor (s) are used to rotate the shaft 6. Each axle drive thus has its own motor or transmission. Such a structure is very advantageous, since the torsional stress of the axle drops to practically zero here, when the force is transmitted to the axle 6 from both its ends right next to the wheels 7. The shaft drive devices are also made smaller in size and weight than in the embodiments according to Figures 1-4, because the stress is evenly distributed over the two shaft drive devices. In the structure according to Figure 5, the unsprung mass of the axle 10 is symmetrical with respect to the longitudinal axis of the vehicle, which improves the running characteristics.

However, it should be noted that the structure using the two shaft drive devices is not limited to the embodiment shown in Fig. 5 alone. Thus, all embodiments such as those shown in Figures 1 to 4 are possible if another corresponding shaft drive device is contemplated in these figures to replace a conventional bearing housing. It should be noted, however, that the embodiment shown in Fig. 5 can be considered to be absolutely the best, since the axle drive devices are located outside the wheels 20, in a favorable position for maintenance and repairs.

However, all the embodiments of the invention described above have in common that the axle drive device (s) simultaneously take care of the transmission and at least the bearing of the other end of the wheel set. In all said embodiments, the following advantages are also achieved. Of the three devices traditionally mounted on the shaft, two remain. Of the six bearings previously required (two bearings in the bearing housings and also two bearings in the shaft drive), only four bearings remain in use. Three precision ground necks can be omitted from the ax-30 paste. In addition, it can be considered a considerable advantage that the shaft can be dimensioned lighter, because the loads on the shaft are smaller in the structures according to the invention. The center of the axle is no longer loaded in the driving situation by the bending moment due to the support torque as in conventional constructions. Also in the structure according to the invention, the bending moment due to the weight of the shaft drive device 35 itself drops to practically zero.

7 72294 1 The structure according to the invention, and in particular the one in which two shaft drive devices are used, achieves a further significant additional advantage. Namely, the braking devices which act directly on the wheels or the transmission members driving the wheels can be mounted directly on the housing of the power transmission. In this case, the forces or moments generated during braking are transmitted to the frame or bogie through the same members with which the axle itself is supported on the frame or bogie. Thus, no separate support members are required for the braking devices.

The invention has been described above with reference to the embodiments shown in its figures. However, it is not intended to limit the invention in any way to these embodiments, but many modifications are possible within the scope of the inventive idea defined by the following claims.

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Claims (7)

A shaft drive device on a rail vehicle for the rail vehicle driving wheels pair, to which the shaft drive device includes at least one transmission housing (1,1a; 21) stored on the driving wheel shaft (6), which contains one with a drive motor (12; 31,32 ) joined driving wheel (2.2a; 22) and a driven wheel (3.3a; 23) and transmission means (4,4a; 24) fixed to the shaft (6a) by which power is transferred from the driving wheel to the driven wheel , characterized in that said transmission housing (1,1a) is provided for storage and support means for one end of the shaft (6) for supporting the shaft of the vehicle's bogie or body (13) so that said transmission housing (1,1a) is stored on said axle (6) next to one wheel (7), the opposing end of said axle (6) being supported on the vehicle's bogie or body (13) by a separate bearing box (8,8a) or the opposite (21). ). 1 Patent Claim 72294 Shaft drive device according to claim 1, characterized in that the transmission housing (1) is mounted on a protruding part of the wheel pair shaft (6) outside one wheel (7) and that the second separate bearing box (8,8a) or the corresponding (21) of the pair of wheels is mounted on a protruding part of the shaft (6) outside the wheel (7) at the opposite end of the shaft (6) or between the wheels (7). Shaft drive device according to claim 1, characterized in that the transmission housing (1a) is stored on the shaft (6) of the wheel pair between the wheels (7) and that the second separate bearing box (8,8a) or the corresponding (21) of the wheel pair is stored on a projecting portion of the shaft (6) outside the wheel (7) at the opposite end of the shaft (6) or between the wheels (7). 30 Shaft drive device according to any of the preceding claims, characterized in that the wheel pair comprises two shaft drive devices, such that the shaft (6) is supported at both ends by the transmission housing (1,1a, 21). 35 Shaft drive device according to any of the preceding claims, characterized in that the transmission housing (1, 1a; 21) is supported on