EP2790992B1 - Drive unit - Google Patents

Description

Technical area

The invention relates to a drive unit for a door leaf, in particular for a passenger rail vehicle door.

State of the art

Passenger room doors of rail vehicles are often designed as so-called sliding or sliding doors with a power drive. Depending on the intended use, these doors are constructed with one or two leaves. As a power drive electrical or pneumatic actuators are in use. These drives have a power source whose rotational or lifting force is transmitted to the door leaf or leaves whereby these leaves are moved between the open position and the closed position. According to a common design, a drive motor acts on the door leaves via a toothed belt or drive spindle. In the case of double-leaf doors, both door leaves are usually actuated together in the case of electric drives. In practical embodiments of power assisted door operators, there are several problems not satisfactorily solved by the prior art solutions. A major problem concerns the installation of the doors or the door drives. This is due to the component tolerances with a high Justieraufwand, which increases the cost of a rail vehicle. This adjustment effort occurs at each door opening of the rail vehicle and therefore forms a great potential for optimization. Another problem is the deformation of the rail vehicle under load. Since, in particular in suburban vehicles (subways, suburban trains, trams) determines the proportion of the mass of passengers a large part of the total vehicle mass, occur as a result of this load deformations of the vehicle, especially in the door openings. These deformations must not interfere with the operation of the power-assisted doors, and very complicated facilities are provided to compensate for these deformations. In particular, these deformations can lead to tension of the door drive train, whereby increased wear is caused.

From the Scriptures DE 199 54 623 A1 is a drive for single or double-leaf sliding doors known, which is arranged to save space in a door profile and uses a hollow shaft motor.

Presentation of the invention

The invention is therefore based on the object to build a drive unit for a door leaf, in particular for a passenger rail vehicle door.

The object is achieved by a drive unit with the features of claim 1. Advantageous embodiments are the subject of the subordinate claims.

According to the basic idea of the invention, a drive unit for a door leaf is constructed, which comprises an electric drive, wherein the rotary movement of the electric drive acts on a spindle nut and a Threaded spindle engages in the spindle nut, said threaded spindle is connected to the door leaf and wherein the electric drive are connected together with the spindle nut by means of a spherical bearing with a car body of a rail vehicle.

According to the invention, an electric drive is provided, which acts on a spindle nut. In particular, a toothed belt drive is suitable for this power transmission, since in this way a slip-free transmission of the driving force can take place. Likewise slip-free can be done by means of a gear transmission, but this is more expensive than a toothed belt drive. Furthermore, it may be advantageous to provide a V-belt drive, which can be realized particularly inexpensive.
The electric drive and the spindle nut form a mechanical unit, wherein in particular the bearing (for example, ball bearing) of the spindle nut is firmly connected to the electric drive. This unit of electric drive and rotatably mounted, driven by the electric drive spindle nut is connected as an essential feature of the invention by means of a spherical bearing with the car body of a rail vehicle. In such a way, said unit is pivotally mounted relative to the car body.
A spherical bearing has an outer guide part with a guide surface in Kugelkalottenform, wherein an inner part is pivotally mounted in this Kugelkalottenführung.

As a result, the advantage can be achieved, component tolerances and deformations of the car body, and the other components of the To be able to balance the door. In particular, can be formed by this pivotable (torque-free) storage no tension and the drive components (power transmission elements such as gears or timing belt and the bearing points) are released from these bracing forces. As a result, the advantage can be achieved to be able to perform a drive unit much cheaper, since, for example, no oversizing with respect to the bracing forces must be made. Furthermore, during operation of a drive unit according to the invention, the maintenance effort can be significantly reduced.

A threaded spindle engages in the spindle nut, so that the rotational movement of the spindle nut is converted into a linear movement of the threaded spindle. This threaded spindle is connected in the region of one of its ends with a door leaf and transmits this linear movement on the door leaf.
The connection point between the threaded spindle and the door leaf is advantageously equipped with a torque-free connection (ball joint). As a result, the advantage can be achieved to be able to compensate for further tolerances of the door leaf and the door leaf guide and to keep the drive further from tension forces. In door leaves of sliding sliding doors, which in addition to the movement in the door level even move vertically to this torque-free linkage is particularly advantageous.

An advantageous development provides for the use of a hollow shaft motor. A hollow shaft motor has an equipped with a longitudinal bore drive shaft, so that the spindle nut can be arranged directly on the drive shaft, or can the spindle nut as part of Shaft be shaped. The threaded spindle penetrates the electric drive in this embodiment of the drive unit.

A further development of the invention, a safety position switch is provided which locks the door leaf in the closed position and protects against unintentional or unauthorized opening (especially while driving). Common safety position switches have a holding device and a safety bolt, which can be moved into the holding device and is fixed by this holding device. The release of the safety bolt by means of an electrical signal, or by switching off an electrical signal. It is advisable to firmly connect the holding device to the drive / spindle nut unit and to connect the safety bolt to the door leaf (or the threaded spindle) so that in the closed position of the door leaf the safety bolt protrudes into the holding device. It is particularly advantageous to equip a drive unit according to the invention with a safety position switch, since such a detection of the door position can be done, which is required for the train control and more signal sensor (limit switch) can be omitted.

The drive unit according to the invention is suitable for all sliding or sliding sliding doors commonly used in rail vehicles, in particular passenger rail vehicles. In double-leaf doors, it is particularly advantageous that each door (door leaf) has its own drive and can be controlled individually. In the case of failure of a drive can thereby affected Door leaf are blocked and the vehicle remain in operation until the repair of the drive.

Brief description of the drawings

Fig.1

Eine Antriebseinheit für ein Türblatt - Seitenansicht.

Fig.2

Eine Antriebseinheit für ein Türblatt - Axialansicht.

They show by way of example:

Fig.1

A drive unit for a door leaf - side view.

Fig.2

A drive unit for a door leaf - axial view.

Embodiment of the invention

Fig.1 shows by way of example and schematically a drive unit for a door leaf in a side view. A drive unit 1 comprises in an exemplary embodiment shown an electric drive 2 which has on its drive shaft a pulley 4, which transmits the rotational movement by means of a toothed belt 5 to a spindle nut 3. The spindle nut 3 has in its bore an internal thread into which the external thread of a threaded spindle 6 engages. This threaded spindle is thus axially displaceable by means of rotational movement of the electric drive 2, or coupled to the electric drive 2 spindle nut 3. At one end of the threaded spindle 7, a ball joint 7 is arranged, which is torque-coupled to a door leaf. To simplify the illustration, components of the vehicle such as door leaves, car body, etc. are not shown.
A holder 10 connects the electric drive 2 with the bearing 8 of the spindle nut 3, so that said components form a unit and at predetermined intervals are firmly positioned to each other. For storage of the spindle nut 3, two ball bearings 8 are shown in the exemplary embodiment shown. This unit of holder 10, electric drive 2 and spindle nut 3 and the associated bearing 8 is pivotally mounted relative to the car body. For this purpose, the holder 10 comprises a spherical bearing 9, the outer part (the kugelkalottenförmige guide) fixed to a fixed part 12 and this further connected to the car body. The inner part of the spherical bearing 9 (the spherical sliding part, which is movably mounted in the spherical cap-shaped guide) is fixedly connected to the holder 10. A safety position switch 11, which comprises a safety pin and a holding device is provided below the threaded spindle. Through the use of this safety position switch 11, the door leaf can be fixed in the closed position

Fig.2 shows by way of example and schematically a drive unit for a door leaf in an axial view. It is the drive unit 1 from Fig.1 in a side view, shown in the axial direction of the threaded spindle 6. The threaded spindle 6 is shown cut.

List of terms

1

drive unit

2

Electric drive

3

spindle nut

4

pulley

5

toothed belt

6

screw

7

ball joint

8th

ball-bearing

9

Spherical bearing

10

bracket

11

Safety limit switches

12

hard part

Claims (9)

1. Drive unit (1) for a door leaf, comprising an electric drive (2), wherein the rotary motion of the electric drive (2) acts on a spindle nut (3) and a threaded spindle (6) engages into the spindle nut (3), wherein said threaded spindle (6) can be connected to the door leaf, characterised in that the electric drive (2) together with the spindle nut (3) can be connected to a car body of a rail vehicle by means of a spherical bearing (9).
2. Drive unit (1) for a door leaf according to claim 1, characterised in that the transmission of the rotary motion of the electric drive (2) to the spindle nut (3) takes place by means of a toothed belt (5).
3. Drive unit (1) for a door leaf according to claim 1, characterised in that the transmission of the rotary motion of the electric drive (2) to the spindle nut (3) takes place by means of a V-belt.
4. Drive unit (1) for a door leaf according to claim 1, characterised in that the transmission of the rotary motion of the electric drive (2) to the spindle nut (3) takes place by means of a gear mechanism.
5. Drive unit (1) for a door leaf according to claim 1, characterised in that a hollow shaft motor is provided as an electric drive, wherein the spindle nut (3) is driven directly by the shaft of the hollow shaft motor.
6. Drive unit (1) for a door leaf according to one of claims 1 to 5, characterised in that the threaded spindle (6) is connected to the door leaf by means of a torque-free bearing (7).
7. Drive unit (1) for a door leaf according to one of claims 1 to 6, characterised in that the door is a sliding door.
8. Drive unit (1) for a door leaf according to one of claims 1 to 6, characterised in that the door is a pivoting sliding door.
9. Drive unit (1) for a door leaf according to one of claims 1 to 8, characterised in that a safety position switch (11) is provided which locks the door in the closed position.

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