DE102006036521B4 - Drive device for an adjustment system in a motor vehicle - Google Patents

Abstract

Drive device for an adjustment system in a motor vehicle with a transmission arranged in a housing (6), comprising: - a drive element (1, 11) with a drive-side actuation element (11), - an output element (2, 24) with a drive-side actuation element ( 24), - a transmission element (3) which is positioned between the drive-side actuating element (11) and the driven-side actuating element (24), - at least one spring element (4) connected to the inner wall of the housing (6) or one with the inner wall - the ends of the spring element (4) are connected to one end of the transmission element (3), and - wherein the spring element (4) with the transmission element (3) and the housing (6) cooperates in such a way that a torque introduced on the drive side is transmitted from the drive element (1, 11) via the transmission element (3) to the output element (2, 24) n, an output side introduced torque is blocked, however, characterized in that the transmission element (3) in guides (115, 245) of the transmission is tilt-mounted, wherein at least one guide (115) in the drive element (1, 11) and at least one Guide (245) in the driven element (2, 24) is formed, wherein the drive-side actuating element (11) in the axial direction of a radially extending main surface (14) of the drive element (1) protrudes and drive-side control and actuating surfaces (113, 114) has, in the presence of a drive-side torque with stop surfaces (331, 341) of the transmission element (3) cooperate, wherein at least one guide (115) in the drive-side actuating element (11) is formed.

Description

The invention relates to a drive device for an adjustment system in a motor vehicle according to the preamble of claim 1.

Drive devices for adjustment systems in motor vehicles can be designed with or without self-locking. Drive devices without self-locking have the advantage of high efficiency. However, they require an additional lock in order to block the transmission torque introduced on the output side and to be able to support output-side forces. For this purpose, it is generally known to provide drives with a freewheel lock or a wrap spring brake.

The DE 199 07 483 A1 describes a double-acting adjusting device for generating a rotary movement, which has a housing in which a drive element, an angle-adjustable by actuation of the drive element output element and a spring element designed in the form of a wrap spring are arranged. The ends of the wrap spring are connected to a transmission element arranged between the drive element and the output element. When a torque introduced into the device on the output side, the wrap spring is widened at its two ends and the transmission of the torque is blocked. With a torque introduced on the drive side, however, the wrap spring is contracted and the torque transmitted.

Another drive device for an adjusting device in a motor vehicle is one of DE 44 05 870 A1 described.

The present invention has for its object to provide a drive device for an adjustment system in a motor vehicle available that provides a barrier for the output side introduced torques in a simple and cost-effective manner.

This object is achieved by a drive device with the features of claim 1. Preferred and advantageous embodiments of the invention are specified in the subclaims.

Thereafter, the solution according to the invention is characterized in that a transmission element of the transmission, via which a torque transmission between a drive-side actuator of the drive element and a driven-side actuator of the output element takes place and which is connected to a transmission on the output side introduced torques blocking spring element, in guides of the transmission is stored tilt-safe. In this case, at least one guide in the drive element and at least one guide in the driven element is formed, wherein the drive-side actuating element of the drive element in the axial direction of a radially extending main surface of the drive element projecting drive-side control and actuating surfaces, which in the presence of a drive-side torque with stop surfaces of Collaborate transmission element, wherein at least one guide is formed in the drive-side actuator. In this case, the transmission element preferably has two symmetrically arranged tongues which serve to prevent tilting and, for this purpose, engage in slots on the one hand of the drive element and on the other hand of the output element. The solution according to the invention is characterized by a simple construction in which the transmission element is arranged in a reliable manner in the transmission in a simple manner and without the use of additional parts.

In a preferred embodiment of the invention, the transmission element in the middle of a guide slot on whose sides preferably the two lateral tongues are formed. The use of a guide slot allows the transfer element to be moved. When a drive-side or driven-side force occurs, the transmission element is displaced along the guide slot. This leads to a simultaneous application of force to both spring ends of the spring element in the same direction, whereby the spring and thus a lock of the transmission are switched depending on the direction of force. The transmission element acts as a reinforcing lever and switching element by simultaneously applying the two spring ends of the spring element in the same direction.

Furthermore, the transmission element is preferably designed such that an upper section and a lower section extend above and below the guide elongated hole, which respectively form radially extending abutment surfaces on opposite sides, which interact with control and actuating surfaces of the drive element and of the output element. The ends of the upper and lower sections preferably each have a receptacle for a bent end of the spring element.

The drive-side actuating element preferably has a radially inner wall and a radially outer wall, which are connected by the drive-side control and actuating surfaces at their ends, wherein the guide is formed at least in the radially inner wall. In particular, the guide is formed by a receiving slot which in the radially inner wall adjacent to the radially extending main surface of Drive element is formed. The drive-side actuating element is preferably formed along a circular arc section about the axis of the drive element or formed in a circular segment.

The output element forms on a radially extending surface, which is provided for example by a bulge, a correspondingly shaped output-side actuating element with output-side control and actuating surfaces.

The drive element is preferably a worm wheel, on which the drive-side actuating element is formed. The aforementioned radially extending main surface preferably extends from a central hollow shaft of the Scheckenrads to an outer toothing of the worm wheel, in which engages, for example, coupled to an electric motor drive screw.

The output element is formed by the output shaft of the drive device. It forms a guide pin for mounting the transmission element, wherein preferably the transmission element is placed in the region of its slot on the guide pin.

In the case of an output-side torque load, an output-side control and actuating surface of the output-side actuating element is supported between the ends of the spring element on a stop surface of the transmission element, so that the force acting on the stop surface is distributed to the two ends of the spring element. This distribution of force takes place in accordance with the leverage laws. The advantage of this embodiment is that a torque introduced on the output side always leads to a widening of the spring element at its two ends and thus to a reliable blocking of the forces introduced on the output side. The transmission element acts according to this function, the expansion of both spring ends as a lever and is therefore also referred to as a boost lever.

Preferably, the output element is rotatably mounted in a bearing opening of the drive element. Drive element and output element are thus not firmly connected or formed in one piece.

The drive element and the driven element are preferably limited to each other angularly rotatable, wherein in a relative movement to each other, a control of the spring element is carried out to the effect that depending on the direction of force transmitted on the drive side torque transmitted to the output element or a driven side torque input is blocked.

The drive element and the driven element are limited in angle relative to each other between two relative positions, wherein the transmission element is movable by the drive element and the output element corresponding to the two relative positions between two switching positions. In this case, in the one switching position, a torque introduced on the output side is blocked and, in the other switching position, a torque introduced on the drive side is transmitted to the output element. The limited angularly rotatable arrangement of input and output element enables switching of the spring element.

In a preferred embodiment, the drive-side actuating element, the transmission element and the output-side transmission element are arranged in a common plane perpendicular to the longitudinal axis of the transmission. Further, the transmission element is arranged in the circumferential direction at least in partial areas between the drive-side actuating element and the output-side actuating element. The drive-side actuator, the output-side actuator and the interposed portions of the transmission element are each formed along a circular arc portion about the axis of the transmission and extend together over an angular range of less than 360 °. The latter is the case so that a limited angularly rotatable arrangement of the input and output element and a switching of the spring element are possible.

The spring element is widened in the one switching position and blocks the transmission of a torque introduced on the output side. In the other switching position, it is contracted and releases the transmission of a torque introduced on the drive side.

It is preferably further provided that a preferably made of steel brake ring is arranged against rotation in the transmission housing, against which the spring element lies radially inwardly, preferably with a bias voltage. In a torque introduced on the output side, a force acts on the transmission element from the output element such that the spring element widens. Here, the spring element is pressed against the inner wall of the brake ring, whereby a transmission of the output side introduced torque is blocked.

The spring element is preferably designed as a wrap spring. However, it is also within the scope of the invention that the spring element is designed as a band-shaped element having a wrap angle of less than 360 °.

The invention will be explained below with reference to the figures of the drawing with reference to preferred embodiments. Show it:

1 an exploded view of a drive device according to the invention for an adjustment system in a motor vehicle with an integrated wrap:

2 the drive device of 1 in exploded view from a 180 ° offset viewing direction;

3 a perspective view of the assembled drive device of 1 and 2 in the direction of the drive side; and

4 a perspective view of the assembled drive device of 1 and 2 in the direction of the output side.

The drive device comprises according to the 1 and 2 a worm wheel 1 , an output shaft 2 , a reinforcement lever 3 , a wrap 4 , a brake ring 5 and a housing half shell 6 ,

The worm wheel 1 represents a drive element of the drive device and is for example driven by means of a drive worm, which is coupled to an electric motor (not shown). The electric motor, the drive worm, the worm wheel 1 as well as the others in the 1 shown and described below components are in a housing consisting of the housing half shell 6 and a further housing half shell.

However, it is also conceivable that the worm wheel 1 is driven in another way, for example by a spur gear or by a manually operable lever.

The worm wheel 1 has an axial opening 12 on, according to the 2 through a hollow shaft 13 of the worm wheel 1 is defined and limited. The axial opening 12 and the hollow shaft 13 serve to accommodate and rotatable mounting of the output shaft 2 , To the axial opening 12 closes a radial main surface 14 which extends to an external toothing 15 of the worm wheel 1 extends.

On the output shaft 2 facing side forms the worm wheel 1 Furthermore, a drive-side actuator 11 from the radial main surface 14 of the worm wheel 1 projecting in the axial direction. The actuator 11 runs along a circular arc section. It consists of a radially inner wall 111 and a radially outer wall 112 , which at their ends to form two radially extending drive-side control and actuating surfaces 113 . 114 are connected. These act as well as corresponding control and actuating surfaces 243 . 244 the output shaft 2 with the reinforcement lever 3 interact as will be explained.

In the radially inner wall 111 is adjacent to the radial major surface 14 an Indian 3 recognizable receiving slot 115 provided that a tip-proof guide for the reinforcement lever 3 provides. The receiving slot 115 is symmetrical with respect to the two control and actuating surfaces 113 . 114 in the radially inner wall 111 educated.

The output shaft 2 has on the output side an external toothing 22 or another gearing or is connected to a gearing. The illustrated external toothing is connected, for example, with the internal toothing of a cable drum. The output shaft 2 also has a guide pin 21 on, the reception and storage of the gain lever 3 serves. Next forms the output shaft 2 in the region of an asymmetrical radial bulge 23 a driven-side actuator 24 from, according to the actuator 11 of the worm wheel 1 is formed and, accordingly, also a radially inner wall 241 , a radially outer wall 242 and two output-side control and actuating surfaces 243 . 244 having. In addition, the radially inner wall forms 241 a receiving slot 245 out.

The reinforcement lever 3 represents a transmission element, the drive element 1 with the output element 2 coupled. The reinforcement lever 3 has an upper and a lower lever portion 33 . 34 on, passing through a central guide slot 30 are separated. Each of the two lever sections 33 . 34 has radially extending abutment surfaces on its sides 331 . 331 ' . 341 . 341 ' on (see also 2 and 3 ). Next are on the reinforcement lever 3 laterally two radially outwardly projecting flat tongues 31 . 32 educated. In the upper and lower lever section 33 . 34 is each a recording 35 . 36 for a crooked loop end 41 . 42 the wrap spring 4 intended.

The housing half shell 6 forms an axial bearing stump 61 for additional storage and support of the drive shaft 2 as well as a bulge 62 for receiving the brake ring 5 and the wrap spring 6 on. The preferably made of steel or another metal brake ring 5 has recesses 51 on, with corresponding projections 63 on the circumference of the bulge 62 Corresponding and a rotation of the brake ring 5 in relation to the housing half shell 6 provide.

The explained components of the drive device are assembled in the fully assembled drive as follows. The reinforcement lever 3 will with his slot 30 on the guide pin 21 the output shaft 2 put on it while holding a tongue 31 of the reinforcement lever 3 in the receiving slot 245 the output shaft 2 plugged in. Both components mounted in this way are then inserted into the axial opening 12 of the worm wheel 1 plugged in. By radial displacement of the reinforcement lever 3 along the long hole 30 in relation to the guide pin 21 becomes the other tongue 32 of the reinforcement lever 3 in the receiving slot 115 of the actuating element 11 of the worm wheel 1 introduced. In this way is the reinforcement lever 3 in non-tilting guides 115 . 245 on the one hand the worm wheel 1 and on the other hand the output shaft 2 stored.

Before or after, the wrap will be 4 with their bent ends 41 . 42 in the appropriate recordings 35 . 36 of the reinforcement lever 3 plugged in. The brake ring 5 gets into the appropriate bulge 62 the housing half shell 6 used against rotation and the wrap spring 4 in the brake ring 5 inserted. The in the housing half shell 6 trained camps 61 serves the additional support and storage of the output shaft 2 for this in the area of their guide pin 21 a central recess (not shown).

When fully assembled, the reinforcement lever is located 3 in the sense between the worm wheel 1 and the output shaft 2 , according to 3 in the circumferential direction, the actuating element 11 of the worm wheel 1 , the upper lever section 33 the boost lever, the output side actuator 24 the output shaft 2 and the lower lever portion 34 of the gain lever follow each other. The drive-side actuator 11 and the output side actuator 24 are each formed along a circular arc portion about the axis of the transmission. The two circular arc sections and the thicknesses in the circumferential direction of the upper lever section 33 and the lower lever section 34 add up to less than 360 °, that is, there is a Winkelverdrehbarkeit between the drive-side actuator 11 and the output side actuator 24 , whereby a switchability of the transmission lever 3 and the loop spring associated with it 4 between two switching positions is possible. The drive-side actuator 11 , the reinforcement lever 3 and the output side actuator 24 lie in a common plane perpendicular to the longitudinal axis of the transmission.

The operation of the drive device is as follows. Upon initiation of a drive-side force, the worm wheel experiences 1 a torque, wherein, depending on the direction of rotation, the upper drive-side control and actuating surface 113 or the lower drive-side control and actuating surface 114 with one of the stop surfaces 331 . 341 of the reinforcement lever 3 comes into contact. In the following, it will be a rotation of the drive-side actuating element 11 counterclockwise from the perspective of 3 considered. Upon rotation of the drive wheel 3 clockwise, the following explanations apply accordingly.

After the upper drive-side control and actuating surface 113 the drive-side actuator 11 with the associated upper stop surface 331 of the upper lever section 33 comes into contact acts on the upper lever section 31 a force that causes a displacement of the boost lever 3 along the guide slot 30 leads. It occurs while the stop surface 331 opposite stop surface 331. ' the amplification lever with the upper output-side control and actuating surface 243 the output side actuator 24 in contact. It is then reached one of the two possible switching positions.

When moving the reinforcement lever 3 becomes the wrap 4 contracted so that the wrap spring 4 from the inside of the brake ring 5 is solved. The wrap 4 thus can not brake or lock a rotary motion. The torque introduced on the drive side is from the worm wheel 1 over the reinforcement lever 3 on the output shaft 2 transfer.

On the output side introduced torque, as occurs in particular in the event of a crash, this is not transmitted to the drive side. For example, if a rotation of the output side in a clockwise direction, so presses the lower output side control and actuating surface 244 against the lower stop surface 341 ' of the lower lever section 34 , whereupon the reinforcement lever 3 along the guide slot 30 is moved. It hits the bottom stop surface 341 of the lower lever section 34 against the lower drive-side control and actuating surface 114 the drive-side actuator 11 , The reinforcement lever 3 is in the second switching position.

Associated with the displacement of the reinforcement lever 3 along the guide slot 30 in the second switching position is an expansion of the wrap spring 4 at both ends 41 . 42 , causing the wrap spring 4 to the inner wall of the brake ring 5 is pressed. The transmission element 3 serves as a boost lever, which acts on both spring ends simultaneously in the same direction with force. As a result, a rotational movement is completely blocked; a transmission of the output side introduced torque to the worm wheel 1 will be prevented.

It is noted that one of the lower output side control and actuating surface 244 on the lower stop surface 341 ' of the reinforcement lever 3 applied force is divided according to the leverage laws on two forces acting on the spring ends 41 . 42 the wrap spring 4 Act. In this context, additional reference to the DE 199 07 483 A1 taken that explains such a force distribution on two Schlingfederenden in detail. Due to the Kraftfaufteilung it comes to a reinforcing effect, which leads to a force on both spring ends 41 . 42 simultaneously in the same direction and thus to a widening of the wrap 4 at both ends 41 . 42 leads. In this respect serves the gain lever 3 according to its name, the division and strengthening of the forces acting.

A self-reinforcing locking system is provided. The greater the load on the wrap spring 4 due to the two ends 41 . 42 acting force is, the greater the slippage of the wrap spring4 is prevented.

During a displacement of the reinforcement lever 3 between the two explained switching positions this is tilt-safe by means of its radially projecting tongues 31 . 32 in the associated receiving slots 115 . 245 stored.

LIST OF REFERENCE NUMBERS

1

worm

11

drive-side actuator

111

radially inner wall

112

radially outer wall

113, 114

upper, lower drive-side control and actuating surface

115

receiving slot

12

axial opening

13

Hollow shaft of the worm wheel

14

radial main surface of the worm wheel

15

External toothing of the worm wheel

2

output shaft

21

Guide pin of the output shaft

22

External toothing of the output shaft

23

asymmetric radial bulge

24

output-side actuator

241

radially inner wall

242

radially outer wall

243, 244

upper, lower output-side control and actuating surface

245

receiving slot

3

Reinforcement lever / transmission element

30

Long guide hole of the reinforcement lever

31, 32

Tongues of the Verstänkungshebels

33

Upper lever section

34

lower lever section

331, 331 '

upper abutment surfaces of the reinforcement lever

341, 341 '

lower abutment surfaces of the reinforcement lever

35, 36

Shooting for loop end

4

wrap

41, 42

crooked loop end

5

brake ring

51

Recesses in the brake ring

6

Housing shell

61

axial bearing stump of the housing half shell

62

Bulge of the housing half shell

63

projections

Claims (26)

Drive device for an adjustment system in a motor vehicle with one in a housing ( 6 ) arranged gear, comprising: - a drive element ( 1 . 11 ) with a drive-side actuating element ( 11 ), - an output element ( 2 . 24 ) with a driven-side actuating element ( 24 ), - a transmission element ( 3 ), which between the drive-side actuating element ( 11 ) and the output side actuator ( 24 ), - at least one spring element ( 4 ), which is connected to the inner wall of the housing ( 6 ) or one with the inner wall of the housing ( 6 ) part ( 5 ), - wherein the ends of the spring element ( 4 ) each having one end of the transmission element ( 3 ), and - wherein the spring element ( 4 ) with the transmission element ( 3 ) as well as the housing ( 6 ) cooperates such that a drive side introduced torque from the drive element ( 1 . 11 ) via the transmission element ( 3 ) on the output element ( 2 . 24 ), on the output side introduced torque is blocked, however, characterized in that the transmission element ( 3 ) in guided tours ( 115 . 245 ) of the transmission is stored tilt-safe, wherein at least one guide ( 115 ) in the drive element ( 1 . 11 ) and at least one tour ( 245 ) in the output element ( 2 . 24 ), wherein the drive-side actuating element ( 11 ) in the axial direction of a radially extending main surface ( 14 ) of the drive element ( 1 ) protrudes and drive-side control and actuating surfaces ( 113 . 114 ), which in the presence of a drive-side torque with stop surfaces ( 331 . 341 ) of the transmission element ( 3 ), whereby at least one tour ( 115 ) in the drive-side actuator ( 11 ) is trained. Drive device according to claim 1, characterized in that the transmission element ( 3 ) at least two symmetrically arranged tongues ( 31 . 32 ), each in a tour ( 115 . 245 ) of the transmission are stored. Drive device according to claim 1 or 2, characterized in that the transmission element ( 3 ) in the middle a guide slot ( 30 ) having. Drive device according to claim 3, characterized in that above and below the guide slot ( 30 ) an upper section ( 33 ) and a lower section ( 34 ) of the transmission element ( 3 ), which in each case on opposite sides radially extending abutment surfaces ( 331 . 331 ' . 341 . 341 ' ) with control and actuating surfaces ( 113 . 114 . 243 . 244 ) of the drive element ( 1 . 11 ) and the output element ( 2 . 24 ) interact. Drive device according to claim 4, characterized in that the ends of the upper and lower portions ( 33 . 34 ) one recording each ( 35 . 36 ) for a cranked end ( 41 . 42 ) of the spring element ( 4 ) exhibit. Drive device according to one of the preceding claims, characterized in that the drive-side actuating element ( 11 ) a radially inner wall ( 111 ) and a radially outer wall ( 112 ) provided by the drive-side control and actuating surfaces ( 113 . 114 ) are connected at their ends, wherein the guide ( 115 ) at least in the radially inner wall ( 111 ) is trained. Drive device according to claim 6, characterized in that the guide ( 115 ) is formed by a receiving slot in the radially inner wall ( 111 ) adjacent to the radially extending major surface ( 14 ) of the drive element ( 1 ) is trained. Drive device according to one of the preceding claims, characterized in that the drive-side actuating element ( 11 ) along a circular arc section about the axis of the drive element ( 1 ) is trained. Drive device according to one of the preceding claims, characterized in that the drive element ( 1 ) is a worm wheel on which the drive-side actuating element ( 11 ) is trained. Drive device according to claim 9, characterized in that the radially extending main surface ( 14 ) from a central hollow shaft ( 13 ) of the Scheckenrads ( 11 ) to an outer toothing ( 15 ) of the worm wheel ( 1 ). Drive device according to one of the preceding claims, characterized in that the output-side actuating element ( 24 ) in the axial direction of a radially extending surface ( 23 ) of the output element ( 2 ) protrudes and output-side control and actuating surfaces ( 243 . 244 ), which in the presence of a driven-side torque with stop surfaces ( 331 ' . 341 ' ) of the transmission element ( 3 ), whereby at least one tour ( 245 ) in the output side actuator ( 24 ) is trained. Drive device according to claim 11, characterized in that the output-side actuator ( 24 ) a radially inner wall ( 241 ) and a radially outer wall ( 242 ), which by the output-side control and actuating surfaces ( 243 . 244 ) are connected at their ends, wherein the guide ( 245 ) at least in the radially inner wall ( 241 ) is trained. Drive device according to claim 12, characterized in that the guide ( 245 ) is formed as a receiving slot in the radially inner wall ( 241 ) adjacent to the radially extending surface ( 23 ) of the output element ( 2 ) is trained. Drive device according to one of claims 11 to 13, characterized in that the output-side actuating element ( 24 ) along a circular arc section about the axis of the output element ( 2 ) is trained. Drive device according to one of claims 11 to 14, characterized in that the output element ( 2 ) a guide pin ( 21 ) for the storage of the transfer element ( 3 ) trains. Drive device according to claims 3 and 15, characterized in that the transmission element ( 3 ) in the area of his Guide slot ( 30 ) on the guide pin ( 21 ) is attached. Drive device according to claims 5 and 11, characterized in that a driven-side control and actuating surface ( 243 . 244 ) of the output side actuator ( 24 ) at a driven side torque input between the ends ( 41 . 42 ) of the spring element ( 4 ) on a stop surface ( 331 ' . 341 ' ) of the transmission element ( 3 ) is supported, so that on the stop surface ( 331 ' . 341 ' ) acting force on the two ends ( 41 . 42 ) of the spring element ( 4 ). Drive device according to one of the preceding claims, characterized in that the output element ( 2 ) in a bearing opening ( 12 ) of the drive element ( 1 ) is rotatably mounted. Drive device according to one of the preceding claims, characterized in that that the drive element ( 1 . 11 ) and the output element ( 2 . 24 ) are limited angle to each other drehverdrehbar, wherein in a relative movement to each other a control of the spring element ( 4 ) is carried out to the effect that, depending on the direction of force, a drive-side introduced torque to the output element ( 2 . 24 ) or a torque introduced on the output side is blocked. Drive device according to claim 19, characterized in that the drive element ( 1 . 11 ) and the output element ( 2 . 24 ) are angularly displaced relative to each other between two relative positions, wherein the transmission element ( 3 ) by the drive element ( 1 . 11 ) and the output element ( 2 . 24 ) is movable according to the two relative positions between two switching positions. Drive device according to claims 11 and 20, characterized in that - the drive-side actuating element ( 11 ), the transmission element ( 3 ) and the output side transmission element ( 24 ) are arranged in a common plane perpendicular to the longitudinal axis of the transmission, and - the transmission element ( 3 ) in the circumferential direction at least in subregions ( 33 . 34 ) between the drive-side actuator ( 11 ) and the output side actuator ( 24 ) is arranged. Drive device according to claim 21, characterized in that the drive-side actuating element ( 11 ), the output side actuator ( 24 ) and the intervening areas ( 33 . 34 ) of the transmission element ( 3 ) are each formed along a circular arc portion about the axis of the transmission and together extend over an angular range of less than 360 °. Drive device according to one of claims 20 to 22, characterized in that the spring element ( 4 ) is widened in the one switching position and the transmission of a torque introduced on the output side blocked and contracted in the other switching position and the transmission of a drive side introduced torque releases. Drive device according to one of the preceding claims, characterized in that (in the gear housing 6 ) rotationally secure a brake ring ( 5 ) is arranged, at the radially inwardly the spring element ( 4 ) is present. Drive device according to claims 22 and 23, characterized in that the spring element ( 4 ) in one of the switching positions on the inner wall of the brake ring ( 5 ) is pressed such that a transmission of a torque introduced on the output side is blocked. Drive device according to one of the preceding claims, characterized in that the spring element ( 4 ) is designed as a wrap.

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