DE2535418A1 - DRIVE DEVICE FOR VEHICLES, IN PARTICULAR RAILWAY VEHICLES - Google Patents

Description

British Railways Board, 222, Marylebone Road, London,

N.W.l, England

"Drive device for vehicles, in particular railway vehicles "

The invention relates to vehicle propulsion devices using an electric motor, in particular but not exclusively on railway vehicles.

The drive between the engine and the axle of an electrically operated railway vehicle chassis normally has one of two forms:

a) The motor is mounted inside the body of the vehicle and the axle is driven by Cardan shafts and a direct final transmission.

b) The motor is attached to the chassis or hangs on the axle and the drive is carried out with help a pair of spur gears and possibly with a belt idler.

Both systems involve some form of gear train in the drive; is the added complexity of a) justified by the benefits of a completely hanging motor.

609810/0284

The fee schedule of the German Chamber of Patent Attorneys applies to the contract. - Place of jurisdiction for performance and payment: Nuremberg. Conversations on the telephone have no legally binding effect

The object of the present invention is to eliminate the external translation.

This is achieved according to the invention in that the motor is within a rotatable tubular wheel axle of the vehicle and drivingly connected to the axle to rotate the axle.

According to a first embodiment of the invention, the motor has a central stator and a rotating one Rotor on the inner surface of the tubular wheel axle.

According to a second embodiment of the invention, a small high speed motor is conventional Construction mounted within a tubular axle and drives this axle via a planetary gear, the is also arranged within the axis.

Because of the harsh environmental conditions under which the engine has to work when used in railway operations and the high speed that is required, an AC cage rotor or, if possible, an induction motor with a non-modified rotor is preferred. To have a high starting torque and sufficient power at speed To get the motor, preferably three-phase alternating current, in the form of variable frequency derived from a static inventor or a rotating electrical machine that runs at a variable speed.

The two above-mentioned exemplary embodiments will now be described by way of example and with reference to the accompanying drawings explained in more detail. It shows:

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Fig. 1 is a partial section of a first embodiment, and

Fig. 2 is a partial section of a second embodiment.

In Fig. 1 and 2, a wheel set of a railway vehicle is shown, which comprises a tubular axle 1 with wheels 2 connected to axis 1 to rotate with it. The ends of the tubular shaft 1 are rotatable mounted in the axle bearing bushes j5.

According to FIG. 1, an induction motor is installed within the tubular axis 1. This comprises a central stator 4 which has an ironed stator core which is divided into two packets of radial laminations 5 and 6 which are axially spaced along the tubular axis 1 and which are carried by a shaped tube 7. The stator changes are clamped and connected to each other to withstand shear loads. Stator windings 8 are attached in slots in the outer circumference of the stator core, which extend in the axial direction. The stator K is supported within the tubular axis by hollow rods 9 and 10 which are fastened in a suitable manner to the stator at their inner ends and which are supported in the axle bearing bushes 3 at their outer end. One or both of the rods 9 and 10 act as a torque reaction rod to impede the rotation of the stator. The rod 9 serves to accommodate the electrical lines (not shown) which lead to the stator windings 8 and the other rod 10 serves as an air duct to conduct pressurized cold air into the motor. The shaped tube 7 is with a

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2 5 3 5 A 1 8

Opening 11 provided with the space between the stator laminations 5 and 6 are aligned and larger than this gap. From there it comes under pressure standing air that arrives through the rod 10 through the opening 11 and splits into an air stream in the Stator between the form tube 7 and the stator interiors and into an air flow into the engine air gaps 12 through the space between the lamella packets 5 and 6.

The rotor 1J> of the motor surrounds the stator 4 and has a rotor core 14 which is fixedly connected to or integrated with the inner surface of the tubular axis 1. Thus, the rotor core 14 can be of a lamellar construction, the lamellas having a tight fit in the tubular axis 1. If fastening rings are attached to the ends of the rotor core 14, a compression of the rotor lamellae can take place by a tension in the axial direction of the tubular axis 1. The rotor core 14 has a short-circuit winding 15.

With rotor bearings only on the axle boxes, the high acceleration prevailing on the axles could result in compensatory movements of the rotor and stator and possibly cause physical contact if the rigidity is not made sufficiently high. To avoid this, further bearings can be fitted between the stator rod 10 and the tubular axis 1 ₍ which are provided as close as possible to the stator in order to keep the effects of compensatory vibrations to a minimum.

Referring to Fig. 2, a motor 20 in the form of a conventional induction motor is supported by a housing 21 within the tubular Axis 1 carried. At one end of the motor housing

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this is supported by a rod 22, which in a the axle bearing bushes 3 is attached. The other end of the motor housing 21 is through the fixed end of a planetary gear 23 on a rod 24 in the other Axle bearing 3 is attached, worn. The rods 22 and 24 then serve as torque reaction rods. the Motor shaft 25 is held in a bearing in a planetary cage 2β of planetary gear 23. One side of the planet cage 26 is attached to the motor housing 21 and the other side is connected to the rod 24 and thus serves as a supporting connection between the motor housing 21 and rod 24. The motor shaft 25 carries a sun gear 27 meshes with the planetary gears 28 from Planet cage 26 are carried and the reverse meshes with a ring gear 29, which with the inner surface the tubular axis 1 is connected.

The size of an induction motor depends mainly on the maximum torque it is supposed to deliver, and is relatively independent of the speed of rotation. Because the output power of an engine is the product of torque and speed, it follows that a high-speed motor can be manufactured which has a has great power-to-weight and power-to-size ratio.

A high speed motor of sufficiently high output power can be built so that it is completely within the tubular axis takes place. The construction can be entirely conventional, but with special attention compared to the warehouse and the supply with sufficient cooling.

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25354Ϊ8

The reduction that is necessary between the motor shaft and the axis can be too great for just one planetary gear set to be handled, s-o that a double gear would then have to be used. An actuation of the gearbox at Such high speeds require special attention to lubrication and an oil mist lubrication system may be needed.

The two exemplary embodiments described above have the following advantages:

a) They have few special requirements for the structure of the chassis and make it possible that the same chassis frames can be used for driven and non-driven chassis.

b) They allow the replacement of DC motors by AC induction motors and reduce so maintenance costs and increase reliability by eliminating commutators.

The first embodiment has the additional advantage that any transmission between the motor and the axle not applicable.

The invention is not limited to the illustrated and described exemplary embodiments. It includes also all professional modifications as well as partial and sub-combinations of the described and / or illustrated Features and measures.

Expectations

609810/0264

Claims (8)

Ajn_s_p_ r ü_c_h_e (V) A vehicle drive device having an electrically driven motor, characterized in that the motor is mounted within a rotatable tubular support shaft and is drivingly connected to the tubular shaft for rotation about that shaft. 2. Apparatus according to claim 1, characterized in that the motor has a central stator and a rotating rotor on the inner surface of the tubular wheel axle. J). Apparatus according to claim 2, characterized in that the stator is carried by at least one rod which extends axially within the tubular wheel axle from one end. 4. Apparatus according to claim ~ 5, characterized in that the rod serves as a torque reaction rod. 5. Apparatus according to claim 5 or 4, characterized in that the rod is hollow and serves as a line to supply the engine with cooling air. 6. Device according to one of claims j5 to 5 *, characterized in that a second rod extends within the tubular axis in the axial direction from the other end and leads electrical lines for the stator windings. 7. Device according to one of claims 2 to 6, characterized in that the rotor has a core which is fixedly connected to the inner surface of the tubular axis. - 2 6G9810 / 0264 8. The device according to claim 1, characterized in that a planetary gear is provided between the motor and the wheel axle within the axis. fc09810 / 0264 Blank page