DE102014008628B4 - Device for winding and unwinding a rope and belt lock with such a device - Google Patents

Abstract

Device for winding and unwinding a cable, in particular for a belt lock, comprising a cable (20), in particular a steel cable, a cable carrier (12) rotatable about an axis (A), a drive (30) for rotating the cable carrier (12) , and a first guide means (14), which determines the radial distance of the rope (20) from the axis (A), characterized in that the maximum number of turns of the rope (20) on the cable carrier (12) is limited to 1.

Description

The invention relates to a device for winding and unwinding a rope. The invention further relates to a buckle with a device for winding and unwinding a rope.

A belt buckle is used to move a buckle to put the seat belt in a comfort position in which the insertion of the tongue of the seat belt is facilitated in the buckle. After putting on the seatbelt, the buckle loader moves the buckle back to a stop position that ensures a good seatbelt restraint and ensures that the buckle does not interfere with vehicle occupants.

In contrast to Gurtschlossbringern with a rigid power transmission element allow those with a flexible power transmission element in the form of a rope, in particular a steel cable, a space-saving design. The cable can transfer the power from the drive of the buckle to the buckle for adjusting the buckle on a curved path adapted to the installation situation. In order to avoid comfort and / or security losses, the power transmission should not be impaired by a load on the rope.

From the DE 103 28 560 A1 For example, a buckle chain is known in which an adjusting plate is driven by a motor through a worm gear. The buckle is coupled via a link guide with the adjusting disc.

The DE 10 2012 102 838 A1 describes a rope-operated belt feeder in which the rope forms a connection between a motor drive and a rack. The rack in turn is in engagement with a toothed adjusting wheel on which a pivot lever is hinged.

The object of the invention is to provide a space-saving and cost-effective power transmission device, in particular for a belt buckle, which works reliably even under tensile or compressive load.

This object is achieved by a device for winding and unwinding a rope having the features of claim 1. Advantageous and expedient embodiments of the device according to the invention are specified in the subclaims.

The inventive device for winding and unwinding a rope, in particular for a buckle, comprises a cable, in particular a steel cable, a cable carrier rotatable about an axis, a drive for rotating the cable carrier, and a first guide device, the radial distance of the rope of the axis determined. According to the invention, the maximum number of turns of the rope on the cable carrier is limited to one. This means that the rope can be wound onto the cable carrier with only one turn, or less.

A significant advantage of limiting the number of turns to 1 is the small size of the device according to the invention in at least one dimension. Since the cable carrier is designed only for a maximum of one cable turn, no space in the axial or radial direction for receiving a winding with a plurality of axially or radially superposed turns must be provided.

In contrast to Gurtschlossbringern with rigid power transmission elements means an increase in the travel distance (distance between the holding position and the comfort position of the buckle) in the inventive device only a relatively small space enlargement. For example, for a doubling of travel only a doubling of the diameter of the winding on the cable carrier is necessary, whereas in a rigid force transmission element whose length would have to be doubled. Expressed mathematically, according to this comparison, the installation space increase in a plane in the device according to the invention is reduced by a factor of 1 / π.

Another advantage of the Windungszahlbegrenzung is the ability to easily perform an absolute rotation angle determination, since the angle measurement only a single 360 ° interval must be covered. This particular aspect will be discussed in more detail later in connection with an advantageous path measuring system for determining the length of the rope wound up or unwound.

Thanks to the extremely simple winding of the rope, only little friction is generated, and the rope is generally stressed little, especially with regard to the deformation during winding and unwinding (curving of the rope). The drive can be correspondingly small in size. In this context, the good self-locking should be emphasized. Since in only one turn an undesirable loose winding of the rope is excluded in principle, no "film coil effect" can occur.

Furthermore, the device according to the invention is characterized by its simple manufacture and assembly with few components and by the low susceptibility to failure.

Thus, in the inventive device, the maximum number of turns 1 can not be exceeded unintentionally, it makes sense to provide means for limiting the rotation of the cable carrier to a maximum of one revolution. These means can be realized in particular in the form of a correspondingly designed control of the drive, for example in conjunction with a stepping motor.

The inventive device for winding and unwinding of a rope can be supplemented in a simple manner by an absolute displacement measuring system for determining the unwound or wound rope length. For this purpose, the displacement measuring system comprises a device for detecting the angle of rotation of the cable carrier. From the angle of rotation and the radius of the winding can namely close easily on the up or unwound cable length. This size is helpful or even necessary for the control or regulation of the cable movement. The particular advantage here is that the cable carrier performs in principle no more than a 360 ° rotation. It is therefore sufficient to know only the rotation angle. On a counting device for counting the rotations, which would otherwise be required for an absolute path determination, can be omitted here.

According to a preferred embodiment of the optional position measuring system, the device for detecting the angle of rotation has a magnetic field sensor and a magnet arrangement. The magnet assembly may comprise only one magnet in the simplest form. For a higher resolution of the rotation angle, however, a plurality of circumferentially arranged on the cable carrier magnets are advantageous. A simple, fixed relative to the rotation of the cable carrier magnetic field sensor is sufficient to detect the rotational angle dependent magnetic field or its change. In principle, a reverse arrangement is possible, d. H. the magnetic field sensor is on the cable carrier and the magnet assembly is fixedly arranged. However, in this case, the wiring of the rotating magnetic field sensor presents some difficulties.

In order to ensure a defined winding with a predetermined diameter, the first cable guide device of the device according to the invention may have at least one circumferential wall at a distance around the axis. In principle, an alternative embodiment is possible in which the rope is guided on the outer circumference of the cable carrier.

However, in the preferred embodiment of the invention, the first guide means has two radially spaced walls between which the cable is received. With a suitable adjustment of the wall distance to the rope diameter, the play of the rope on the cable carrier can be reduced to a minimum. Taking into account the inevitable tolerances, a distance should be sought that is only slightly greater than the rope diameter.

In any case, the radial distance of the two walls should be smaller than twice the diameter of the rope. This measure ensures namely that only one cable turn is possible at least in the radial direction.

Also advantageous is a second guide means, by means of which the cable is fed to the cable carrier at a predetermined angle or by means of which the cable is led away from the cable carrier at a predetermined angle. A defined cable course achieved in this way can effectively prevent jamming of the cable or other undesired or uncontrolled contact with other components.

The second guide device can be formed, for example, by a pair of rollers between which the cable is made. In contrast to only one role or only a simple support for the rope ensures a suitably arranged pair of rollers a defined passage or deflection point of the rope.

As a drive of the device according to the invention is particularly suitable a motor-driven worm shaft or a motor-driven gear, which engages in a suitable toothing of the cable carrier.

However, the device according to the invention can also be realized with other drives. For example, the drive may have a shaft to which the cable carrier is non-rotatably coupled, or the drive comprises a belt transmission.

The invention also provides a buckle with a device of the type described above, in which a buckle is coupled to the rope. With regard to the advantages of the invention Gurtschlossbringers can be made to the corresponding above statements on the advantages of the device according to the invention for winding and unwinding of a rope.

Further details of the invention will become apparent from the following description and from the accompanying drawings, to which reference is made. In the drawings show:

1 a plan view of an inventive device for winding and unwinding a rope according to a preferred embodiment;

2 a side view of the device according to the invention;

3 a sectional view taken along the line AA in 1 ; and

4 a perspective view of the device according to the invention.

In the 1 to 4 a device for winding and unwinding a rope is shown, which is intended for use in a belt buckle.

The device comprises one in a housing shell 10 rotatably mounted cable carrier 12 with a first cable guide device 14 , In the illustrated embodiment, the cable carrier 12 essentially of a disk with a double wall extending on one side in the axial direction. The double wall has two radially spaced walls 16 . 18 on, each at a distance about the axis of rotation A of the cable carrier 12 circulate. ("Circulation" should not necessarily mean that the two walls 16 . 18 completely (360 °).)

Between the walls 16 . 18 is a rope 20 , in particular a steel cord, whose one end 22 on the rope carrier 12 is fixed. The other end of the rope 20 is coupled to a buckle (not shown), which can be transferred by means of the device for putting on or taking off a seat belt in a comfort position and then moved back to a remote holding position.

A second cable guide device 24 makes sure the rope 20 at a certain angle to the plane on which the rope 20 in the rope carrier 12 rests, to the rope carrier 12 out or from the cable carrier 12 is led away. The second guide device 24 here consists of two spaced roles 26 . 28 between which the rope 20 is performed. The axes of the roller pair 26 . 28 are parallel to the support plane of the rope 20 oriented.

The device further comprises a drive 30 for turning the cable carrier 12 in two different directions of rotation. In the illustrated embodiment, the drive 30 a motor driven worm shaft 32 on that in an external toothing 34 of the cable carrier 12 intervenes. But there are also other types of drive possible.

1 shows the device at maximum rope rewind, ie the rope 20 can only do with a little less than a full turn on the rope carrier 12 be wound up. The control of the drive 30 is accordingly designed so that the rotation of the cable carrier 12 is limited to a maximum of one revolution. The small distance of the double wall on the cable carrier 12 allowed - at least in the radial direction - anyway only a rope layer on the cable carrier 12 ,

In order to determine the unwound rope length, the device may be equipped with an absolute displacement measuring system (not shown in the figures). The path measuring system comprises a magnet arrangement with one or more circumferentially on the cable carrier 12 arranged magnets and an opposite, relative to the cable carrier 12 immovable magnetic field sensor. During a rotation, it can be concluded from the change of the magnetic field registered by the magnetic field sensor to the absolute rotation angle within a 360 ° interval. From the absolute angle of rotation, the radius of the rope winding on the cable carrier 12 and some other immutable parameters, the wound or unwound rope length can be determined.

Because the maximum number of turns of the rope 20 on the rope carrier 12 is limited to 1, the result of the angle measurement is always unique, ie it never has to be added or subtracted a turn length.

The device is modular, d. H. All essential components can be arranged as required around the rotatable cable carrier as far as possible. Lubrication of the moving components is usually not required.

Although the preferred application of the described device for winding and unwinding a rope is the use in a buckle presenter in a motor vehicle, the device may also be useful for other purposes.

LIST OF REFERENCE NUMBERS

10

shell

12

Cords

14

first guide device

16

wall

18

wall

20

rope

22

rope end

24

second guide device

26

role

28

role

30

drive

32

worm shaft

34

external teeth

A

Rotary axis of the cable carrier

Claims (13)

Device for winding and unwinding a rope, in particular for a belt-buckle-type bringer, with a rope ( 20 ), in particular a steel cable, a cable carrier rotatable about an axis (A) ( 12 ), a drive ( 30 ) for rotating the cable carrier ( 12 ), and a first guide device ( 14 ), which determines the radial distance of the rope ( 20 ) determined by the axis (A), characterized in that the maximum number of turns of the rope ( 20 ) on the cable carrier ( 12 ) is limited to 1. Apparatus according to claim 1, characterized by means for limiting the rotation of the cable carrier ( 12 ) to a maximum of one revolution. Apparatus according to claim 1 or 2, characterized by an absolute displacement measuring system with a device for detecting the angle of rotation of the cable carrier ( 12 ). Apparatus according to claim 3, characterized in that the means for detecting the rotation angle comprises a magnetic field sensor and a magnet arrangement. Device according to one of the preceding claims, characterized in that the first guide device ( 14 ) at least one at a distance about the axis (A) circumferential wall ( 16 ; 18 ) having. Apparatus according to claim 5, characterized in that the first guide means ( 14 ) two radially spaced walls ( 16 . 18 ) between which the rope ( 20 ) is recorded. Apparatus according to claim 6, characterized in that the radial distance of the two walls ( 16 . 18 ) smaller than twice the diameter of the rope ( 20 ). Device according to one of the preceding claims, characterized by a second guide device ( 24 ), by means of which the rope ( 20 ) the cable carrier ( 12 ) supplied at a predetermined angle or by means of the rope ( 20 ) at a predetermined angle from the cable carrier ( 12 ) is led away. Apparatus according to claim 8, characterized in that the second guide device ( 24 ) by a pair of rollers ( 26 . 28 ) is formed, between which the rope ( 20 ) is performed. Device according to one of the preceding claims, characterized in that the drive ( 30 ) a worm shaft ( 32 ) or a gear that in a toothing ( 34 ) of the cable carrier ( 12 ) intervenes. Device according to one of claims 1 to 9, characterized in that the drive ( 30 ) has a shaft to which the cable carrier ( 12 ) is rotatably coupled. Device according to one of the preceding claims, characterized in that the drive ( 30 ) comprises a belt transmission. Gurtschlossbringer with a device according to one of the preceding claims, characterized in that a buckle to the rope ( 20 ) is coupled.

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