JP2008064307A - Drive mechanism for automobile control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive mechanism for an automobile control system, capable of easily locking torque introduced to the output side in a highly cost effective manner. <P>SOLUTION: The drive mechanism for the automobile control system comprises a housing (6), and a transmission mechanism arranged therein which has a drive member (1, 11) having a drive side operation member (11), an output member (2, 24) having an output side operation member (24), a transmission member (3) arranged between the drive side operation member (11) and the output side operation member (24), and at least one spring member (4) for interacting with the inner wall of the housing (6) or with a component 5 connected to the inner wall of the housing (6). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving device for an adjustment system of a motor vehicle, and relates to a driving device according to the preamble of claim 1.

  The earlier German application No. 10 2006 036 521.6 dated July 28, 2006 is hereby incorporated herein by reference. The drive for an automotive adjustment system can be designed with or without self-locking. A drive without self-locking has the advantage of being very efficient. However, they require additional locking so that transmission of torque introduced to the output side can be prevented and output side forces can be supported. For this purpose it is basically known to provide a freewheel lock or a wrap spring brake in the drive.

  U.S. Pat. No. 6,057,056 describes an adjustment device that is operated on both sides and is adapted to produce a rotational movement, such an adjustment device having a drive member and an output whose angle is adjustable by actuation of the drive member. It has a housing in which a member and a spring member designed in the form of a wound spring are arranged. An end portion of the winding spring is connected to a transmission member disposed between the drive member and the output member. When torque is introduced into the adjusting device on the output side, the winding springs extend at both ends, preventing torque transmission. In contrast, when torque is introduced to the drive side, the winding spring contracts and torque is transmitted.

German patent application DE 199 07 483 A1

  SUMMARY OF THE INVENTION An object of the present invention is to provide a drive device for an automobile adjustment system, which can easily and cost-effectively lock the torque introduced to the output side.

  This object is achieved according to the invention by a drive device having the features of claim 1. Preferred advantageous refinements of the invention are indicated in the dependent claims.

  According to this, the problem-solving means according to the present invention is a transmission member of a transmission mechanism that transmits torque between the drive-side operation member of the drive member and the output-side operation member of the output member, and is introduced to the output side. A transmission member connected to a spring member for preventing transmission of torque is attached to a guide of the transmission mechanism so as to prevent inclination. In this case, the transmission member preferably has two tongues arranged symmetrically, which act to hold the transmission member against tilting, for this purpose the first Is engaged with the groove of the drive member, and secondly is engaged with the groove of the output member. The solution according to the invention is characterized by a simple arrangement in which the transmission member is arranged in the transmission mechanism in a simple and functionally reliable manner without the use of additional components.

  In a preferred refinement of the invention, the transmission member has a guide hole which is a slot in the center, preferably two lateral tongues are formed on the sides of this hole. By using the guide hole which is a long hole, the transmission member can be displaced. When a force is generated on the drive side or the output side, the transmission member is displaced along the guide hole which is a long hole. As a result, a force acts simultaneously on both spring ends of the spring member in the same direction. As a result, the spring, that is, the locking of the transmission mechanism is switched according to the direction of the force. The transmission member acts on both spring ends of the spring member at the same time in the same direction, thereby functioning as a reinforcing lever and a switching member.

  Further, the transmission member is preferably designed such that the upper and lower portions extend above and below the guide hole to form radially extending stopper surfaces on both sides, respectively, and these stopper surfaces are the drive member and the output member. Interacts with the control and operation surfaces of Preferably, the upper and lower ends have respective receiving portions for the bent ends of the spring member.

  In a preferred embodiment, the drive side actuating member of the drive member has a drive side control / actuating surface protruding from the main surface extending in the radial direction of the drive member in the axial direction. When the drive side has torque, it interacts with the stopper surface of the transmission member. In this case, preferably, the drive side operation member has a radially inner wall and a radially outer wall connected by a drive side control / operation surface at an end portion, and the guide is at least radially inward. It is formed on the wall. Specifically, the guide is constituted by a housing groove formed in a radially inner wall adjacent to the main surface extending in the radial direction of the drive member. The drive side actuating member is preferably formed along a part of an arc centered on the axis of the drive member, or is designed in the shape of a part of a circle.

  In the output member, for example, an output side operation member having a shape corresponding to the drive member is formed on the surface extending in the radial direction formed by overhanging, with an output side control / operation surface.

  The drive member is preferably a worm gear in which a drive side operation member is formed. The radially extending main surface preferably extends from the hollow shaft at the center of the worm gear to the external teeth of the worm gear (for example, engaged with a drive worm connected to an electric motor).

  The output member is formed by the output shaft of the drive device. The output member forms a guide pin for attachment of the transmission member, preferably the transmission member is arranged on the guide pin in the region of the slot of the transmission member.

  When there is a torque load on the output side, the output side control / actuation surface of the output side actuating member is supported by the stopper surface of the transmission member between the ends of the spring member, and the force acting on the stopper surface is Distributed to both ends of the member. This force distribution is performed according to the lever principle. The advantage of this arrangement is that the torque introduced on the output side always causes the spring member to spread at both ends of the spring member, thus reliably preventing the force introduced on the output side. This action of spreading both ends of the spring causes the transmission member to function as a lever and is therefore also referred to as a reinforcing lever.

  The output member is preferably rotatably mounted in the bearing opening of the drive member. Therefore, the driving member and the output member are not fixedly connected and are not formed as one component.

  The drive member and the output member are preferably rotatable relative to a limited angle, and when moving relative to each other, a spring member is introduced on the drive side depending on the direction of the force in each case. The torque is transmitted to the output member or controlled so that the torque introduced to the output side is blocked.

  The drive member and the output member are relatively rotatable to a limited angle between the two relative positions, and the transmission member is moved between the two switching positions according to the two relative positions by the drive member and the output member. Is possible. In this case, the torque introduced to the output side is blocked at one switching position, and the torque introduced to the drive side is transmitted to the output member at the other switching position. The spring member can be switched by the arrangement configuration of the drive member and the output member that can rotate at a certain angle to a limited range.

  In a preferred embodiment, the driving side actuating member, the transmission member, and the output side transmission member are arranged on a common plane that is perpendicular to the longitudinal axis of the transmission mechanism. Further, the transmission member is disposed in the circumferential direction at least in a partial region between the drive side operation member and the output side operation member. A region disposed between the drive side operation member, the output side operation member, and the transmission member is formed along a part of an arc centering on the axis of the transmission mechanism, and is 360 as a whole. Spread over an angular region of less than °. The latter is an arrangement configuration of the drive member and the output member that can be rotated at a certain angle to a limited range and that enables switching of the spring member.

  The spring member extends at one switching position to prevent transmission of torque introduced to the output side. At the other switching position, the torque contracted and transmitted to the drive side is transmitted.

  Furthermore, preferably the brake ring (part connected to the inner wall of the housing), on which the spring member is pressed radially on the inner surface, is preferably made of steel and preferably does not rotate in a prestressed state And is disposed in the housing of the transmission mechanism. When torque is introduced to the output side, force acts to spread the spring member from the output member to the transmission member. In this case, the spring member is pressed against the inner wall of the brake ring, and as a result, transmission of torque introduced to the output side is prevented.

  The spring member is preferably formed as a wound spring. However, it is also within the technical scope of the present invention to design the spring member as a band-shaped member having a winding angle of less than 360 °.

  In the following, the invention will be described in more detail using preferred exemplary embodiments and with reference to the drawings.

  According to FIGS. 1 and 2, the drive device has a worm gear 1, an output shaft 2, a strengthening lever 3, a winding spring 4, a brake ring 5 and a housing half 6 formed by a half shell.

  The worm gear 1 constitutes a drive member of the drive device, and is driven by a drive worm connected to, for example, an electric motor (not shown). The electric motor, drive worm, worm gear 1 and further components shown in FIG. 1 and described below are arranged in a housing having a housing half 6 and a further housing half.

  However, it is also conceivable to drive the worm gear 1 in another way, for example by means of a spur gear or a manually operated adjustment lever.

  The worm gear 1 has an axial opening 12 defined and bounded by a hollow shaft 13 of the worm gear 1 according to FIG. The axial opening 12 and the hollow shaft 13 function to accommodate and rotatably mount the output shaft 2. Adjacent to the axial opening 12 is a main surface 14 that extends radially to the outer teeth 15 of the worm gear 1.

  Further, on the surface facing the output shaft 2, a drive side actuating member 11 is formed on the worm gear 1 so as to protrude in the axial direction from the radial main surface 14 of the worm gear 1. The actuating member 11 extends along a part of the arc. The actuating member 11 has a radially inner wall 111 and a radially outer wall 112, and the walls 111, 112 have two drive side control / actuation surfaces 113 extending in the radial direction at their ends. 114 is connected. As will be described later, the latter (113, 114) interacts with the reinforcing lever 3 in the same manner as the control / operation surfaces 243, 244 of the corresponding output shaft 2.

  The guide receiving groove 115 (which can be seen in FIG. 3) is adjacent to the main radial plane 14 on the radially inner wall 111, and one side of the receiving groove 115 is substantially flush with the main flat plane 14. The reinforcement lever 3 is provided while guiding the reinforcement lever 3 while preventing the inclination of the reinforcement lever 3. The housing groove 115 is formed symmetrically with respect to the two control / operation surfaces 113 and 114 in the radially inner wall 111.

  On the output side, the output shaft 2 has external teeth 22 or another type of tooth or is connected to external teeth. The external teeth shown are connected to the internal teeth of a cable drum, for example. Further, the output shaft 2 has a guide pin 21 that functions to accommodate and attach the reinforcing lever 3. Further, the output shaft 2 is designed to correspond to the actuating member 11 of the worm gear 1 in the region of the asymmetric overhang 23 that extends in the radial direction, and therefore, the radially inner wall 241 and the radially outer wall 242 are also designed. , And an output side actuating member 24 having two output side control and actuating surfaces 243, 244 is formed. Further, a housing groove 245 is formed in the radially inner wall 241.

  The reinforcing lever 3 constitutes a transmission member that connects the driving member 1 to the output member 2. The reinforcing lever 3 has an upper lever portion 33 and a lower lever portion 34 that are separated by a guide hole 30 that is a central elongated hole. Each of the two lever portions 33, 34 has a stopper surface 331, 331 ', 341, 341' extending radially on the side surface (see also FIGS. 2 and 3). Further, flat tongue pieces 31 and 32 protruding outward in the radial direction are formed on the side surface of the reinforcing lever 3. Accommodating portions 35, 36 for the bent winding spring ends 41, 42 of the winding spring 4 are provided in the lever upper portion 33 and the lever lower portion 34, respectively.

  The housing half 6 is formed with a bearing projection 61 that serves as a bearing for further mounting and support of the drive shaft 2 as an output shaft, and an overhang 62 for receiving the brake ring 5 and the winding spring 4. The brake ring 5 is preferably made of steel or other metal and has a cutout 51, the cutout 51 coincides with a corresponding projection 63 provided on the outer periphery of the overhang 62, and the brake ring 5 is connected to the housing half Means for fixing so as not to rotate with respect to 6 is formed.

  The components of the drive device are assembled as follows to become an assembled drive unit. The reinforcing lever 3 of FIG. 1 is attached to the guide pin 21 of the output shaft 2 through the elongated hole 30, and one tongue piece 31 of the reinforcing lever 3 is inserted into the receiving groove 245 of the output shaft 2 in this process. The two parts fitted together in this way are then inserted into the axial opening 12 of the worm gear 1. By displacing the reinforcing lever 3 with respect to the guide pin 21 along the elongated hole 30, the other tongue piece 32 of the reinforcing lever 3 of FIG. 3 is introduced into the receiving groove 115 of the operating member 11 of the worm gear 1. . In this manner, the reinforcing lever 3 is attached to the guide 115 of the worm gear 1 first and secondly to the guide 245 of the output shaft 2 so as to prevent tilting.

  Before or after the winding spring 4 is inserted into the corresponding receiving part 35, 36 of the reinforcing lever 3 by means of bent winding spring ends 41, 42. The brake ring 5 of FIG. 2 is inserted into the corresponding overhang 62 of the housing half 6 so as not to rotate, and the winding spring 4 is arranged in the brake ring 5. A bearing 61 formed in the housing half 6 serves to further support and attach the output shaft 2, and for this purpose the output shaft 2 is notched in the middle of the guide pin 21 (not shown). have.

  In this assembled state, the reinforcing lever 3 in FIG. 1 is operated between the worm gear 1 and the output shaft 2, the operating member 11 of the worm gear 1, the lever upper portion 33 of the reinforcing lever 3, and the output side operation of the output shaft 2. The member 24 and the lever lower part 34 of the reinforcing lever 3 move following each other in the circumferential direction of FIG. In this case, the drive side operation member 11 and the output side operation member 24 are each formed along a part of an arc centered on the axis of the transmission mechanism, and are positioned on the plane together with the reinforcing lever 3. . The thickness in the circumferential direction of the two parts of the arc, and the lever upper part 33 and the lever lower part 34 is less than 360 ° in total, ie the drive side actuating member 11 and the output side actuating member 24 are still at a certain angle. The transmission lever 3 and the winding spring 4 connected to the transmission lever 3 can be switched between two switching positions. The drive side operation member 11, the reinforcing lever 3, and the output side operation member 24 are located on a common plane perpendicular to the longitudinal axis of the transmission mechanism.

  The operation of the driving device is as follows. When a force is introduced to the drive side, torque is applied to the worm gear 1, and the upper drive side control / operation surface 113 or the lower drive side control / operation surface 114 serves as the stopper surfaces 331, 341 of the reinforcing lever 3. One of the two contacts and acts in the direction of rotation. In the following, the counterclockwise rotation of the drive side operation member 11 will be examined with reference to FIG. For the clockwise rotation of the drive gear 1 (worm gear 1), the following details apply in a corresponding manner.

  After the upper drive side control / operation surface 113 of the drive side operation member 11 contacts the corresponding upper stopper surface 331 of the lever upper portion 33, a force acts on the lever upper portion 31, and this force is a guide that is a long hole. The displacement of the reinforcing lever 3 is caused along the hole 30. In this process, the reinforcing lever stopper surface 331 ′ (located on the opposite side of the stopper surface 331) contacts the output-side control / operation surface 243 on the upper side of the output-side operation member 24. As a result, one of the two possible switching positions is achieved.

  When the reinforcing lever 3 is displaced, the winding spring 4 is contracted so that the winding spring 4 is released from the inside of the braking ring 5 of FIG. As a result, the winding spring 4 cannot brake or prevent the rotational movement. Torque introduced to the drive side is transmitted from the worm gear 1 to the output shaft 2 via the reinforcing lever 3.

  In contrast, no transmission to the drive side occurs when torque is introduced on the output side, particularly as occurs in the case of a collision. For example, when rotation from the output side occurs in the clockwise direction, the lower output side control / operation surface 244 in FIG. 3 is pressed against the lower stopper surface 341 ′ of the lever lower portion 34, and the reinforcing lever 3 is elongated. It is displaced along the guide hole 30. In this process, the lower stopper surface 341 of the lever lower portion 34 comes into contact with the lower drive side control / operation surface 114 of the drive side operation member 11. In this state, the reinforcing lever 3 is in the second switching position.

  Due to the displacement of the reinforcing lever 3 that moves to the second switching position along the guide hole 30 that is a long hole, the winding spring 4 spreads at both ends 41, 42, and as a result, the winding spring 4 moves to the inner wall surface of the brake ring 5. Pressed against. In this case, the transmission member 3 functions as a reinforcing lever that applies a force to both ends of the spring simultaneously in the same direction. Thereby, the rotational movement is completely prevented, that is, the transmission of the torque introduced to the output side to the worm gear 1 is prevented.

  The force applied from the lower output side control / actuation surface 244 to the lower stopper surface 341 'of the reinforcing lever 3 is divided into two forces acting on the spring ends 41, 42 of the winding spring 4 according to the lever principle. The point should be noted. In this regard, further reference is made to US Pat. No. 6,057,077 which details the distribution of such forces to the two ends of the winding spring. The force distribution produces a strengthening effect and forces are simultaneously introduced into the spring ends 41, 42 in the same direction, resulting in the winding spring 4 spreading at the ends 41, 42. In this respect, the augmenting lever 3 functions substantially for force distribution and augmentation, as its name suggests.

  A self-enhancing fixation system is provided. When the load of the winding spring 4 becomes large, the force acting on both ends 41 and 42 prevents the winding spring 4 from slipping more strongly.

  The reinforcing lever 3 is mounted in the associated receiving grooves 115 and 245 so as to prevent tilting by the tongue pieces 31 and 32 projecting in the radial direction when displaced between the two switching positions described above.

1 shows an exploded view of a drive device for an automobile adjustment system according to the present invention, which comprises an integrated winding spring. FIG. 2 shows an exploded view of the drive device of FIG. 1 as viewed from a direction shifted by 180 °. The perspective view seen from the direction of the drive side of the assembled drive device of FIG. 1 and FIG. 2 is shown. The perspective view seen from the direction of the output side of the assembled drive device of FIG. 1 and FIG. 2 is shown.

Explanation of symbols

1 Worm gear
11 Drive side actuating member
111 radially inner wall
112 radially outer walls 113, 114 upper and lower drive side control / actuation surfaces
115 receiving groove
12 Axial opening
13 Hollow shaft of worm gear
14 Main surface spreading in the radial direction of the worm gear
15 Worm gear external teeth
2 Output shaft
21 Output shaft guide pin
22 External teeth of output shaft
23 Asymmetric radial overhang
24 Output side actuating member
241 radially inner wall
242 Radial outer wall 243, 244 Upper and lower output side control and actuation surfaces
245 receiving groove
3 Strengthening lever and transmission member
30 Guide holes which are elongated holes of the reinforcing lever 31, 32 Tongue pieces of the reinforcing lever
33 Upper lever
34 Lever lower portion 331, 331 ′ Upper stopper surface of the reinforcing lever 341, 341 ′ Lower stopper surface of the reinforcing lever 35, 36 Housing for the end of the winding spring
4 Winding springs 41, 42 Ends of bent winding springs
5 Brake ring
51 Brake ring cutout
6 Housing half
61 Housing half bearing protrusion
62 Overhang of housing half
63 Protrusion

Claims (28)

In the housing (6)
A drive member (1, 11) comprising a drive side actuating member (11);
An output member (2, 24) comprising an output side actuating member (24),
The transmission member (3) disposed between the drive side operation member (11) and the output side operation member (24), and connected to the inner wall of the housing (6) or the inner wall of the housing (6) At least one spring member (4) interacting with the component (5)
Have
The end of the spring member (4) is connected to one end of the transmission member (3), and the torque introduced into the drive side of the spring member (4) is generated from the drive member (1, 11). While being transmitted to the output member (2, 24) via the transmission member (3), the transmission member (3) and the housing (6) are prevented so that torque introduced to the output side is blocked. In a drive device for an adjustment system of an automobile provided with a transmission mechanism that interacts with
The drive device according to claim 1, wherein the transmission member (3) is mounted in a guide (115, 245) of the transmission mechanism so as to prevent inclination.   2. The transmission member (3) according to claim 1, comprising at least two tongues (31, 32) arranged symmetrically, each mounted in a guide (115, 245) of the transmission mechanism. A drive device characterized by that.   3. The drive unit according to claim 1, wherein the transmission member (3) has a guide hole (30) which is a long hole in the center.   The stopper surface (3) according to claim 3, wherein the upper part (33) and the lower part (34) of the transmission member (3) extend above and below the guide hole (30), which is a long hole, and extend radially on both sides. 331, 331 ′, 341, 341 ′) and stopper surfaces (331, 331 ′, 341, 341 ′) are used to control the drive member (1, 11) and the output member (2, 24). A drive device characterized by interacting with the working surface (113, 114, 243, 244).   5. The upper and lower parts (33, 34) according to claim 4, each having a receiving part (35, 36) for a bent end (41, 42) of the spring member (4). A drive device characterized by that.   The at least one guide (115) is formed on the drive member (1, 11) and the at least one guide (245) is the output member (2, 24) according to any one of claims 1-5. It is formed in the drive device characterized by the above-mentioned.   7. The transmission member according to claim 6, wherein the drive side actuating member (11) protrudes in an axial direction from a main surface (14) extending in a radial direction of the drive member (1) and has torque on the drive side. (3) having the drive side control / operation surface (113, 114) that interacts with the stopper surface (331, 341), and at least one guide (115) is provided on the drive side operation member ( 11) The drive device characterized by being formed.   8. The drive-side actuation member (11) according to claim 7, wherein the end portions of the drive-side actuation member (11) are connected to each other by a drive-side control / actuation surface (113, 114). 112), and the guide (115) is formed at least on the radially inner wall (111).   9. The guide (115) according to claim 8, comprising a receiving groove formed in the radially inner wall (111) adjacent to the radially extending main surface (14) of the drive member (1). The drive device characterized by the above-mentioned.   10. The drive side actuating member (11) according to claim 6, wherein the drive side actuating member (11) is formed along a part of an arc centered on the axis of the drive member (1). Drive device.   11. The drive device according to any one of claims 6 to 10, wherein the drive member (1) is a worm gear formed with the drive side operation member (11).   In claim 11, the radially extending main surface (14) extends from the hollow shaft (13) at the center of the worm gear (1) to the external teeth (15) of the worm gear (1). The drive device characterized.   13. The output side actuating member (24) according to any one of claims 6 to 12, wherein the output side actuating member (24) protrudes in an axial direction from a radially extending surface (23) of the output member (2), and torque is output to the output side. At least one of the guides (245) has the output-side control / actuation surface (243, 244) that interacts with the stopper surface (331 ′, 341 ′) of the transmission member (3) at a certain time. Is formed on the output side actuating member (24).   In Claim 13, the output side actuating member (24) has a radially inner wall (241) and a radially outer wall (24) whose ends are connected by the output side control / actuating surface (243, 244). 242), and the guide (245) is formed on at least the radially inner wall (241).   15.The guide (245) according to claim 14, wherein the guide member (245) is formed as a receiving groove formed in the radially inner wall (241) adjacent to the radially extending surface (23) of the output member (2). A drive device characterized by that.   16. The output side actuating member (24) according to any one of claims 13 to 15, wherein the output side actuating member (24) is formed along a part of an arc centered on an axis of the output member (2). Drive device.   17. The driving device according to claim 13, wherein the output member (2) forms a guide pin (21) for mounting the transmission member (3).   The transmission member (3) according to any one of claims 3 to 17, wherein the transmission pin (21) is arranged on the guide pin (21) in a region of the guide hole (30) which is the elongated hole. Drive device.   The output side control / operation surface (243, 244) of the output side operation member (24) when the torque is introduced to the output side according to claim 5, 7, and 13, the spring member (4) The force acting on the stopper surface (331 ′, 341 ′) supported by the stopper surface (331 ′, 341 ′) of the transmission member (3) between the end portions (41, 42) of the transmission member (3) A drive device, characterized in that it is distributed to both ends (41, 42) of the spring member (4).   Drive device according to any one of the preceding claims, characterized in that the output member (2) is rotatably mounted in a bearing opening (12) of the drive member (1).   21. The drive member (1, 11) and the output member (2, 24) according to any one of the preceding claims, wherein the drive member (1, 11) and the output member (2, 24) are capable of relative rotation up to a limited angle, Depending on the direction of force in each case, the spring member (4) transmits torque introduced to the drive side to the output member (2, 24) or torque introduced to the output side. The drive device is controlled so as to be blocked.   In claim 21, the drive member (1, 11) and the output member (2, 24) are relatively rotatable to a limited angle between two relative positions, the transmission member (3) A drive device characterized in that the drive member (1, 11) and the output member (2, 24) can move between two switching positions corresponding to two relative positions. In claims 7, 13, and 22,
The drive side operation member (11), the transmission member (3), and the output side transmission member (24) are disposed on a common plane perpendicular to the longitudinal axis of the transmission mechanism,
The transmission member (3) is arranged in a circumferential direction at least in a partial region (33, 34) between the drive side operation member (11) and the output side operation member (24). To drive.   24. The region (33, 34) arranged between the drive side actuating member (11), the output side actuating member (24) and the transmission member (3). A drive device characterized by being formed along a part of an arc centering on the axis of the transmission mechanism and extending over an angle region of less than 360 ° as a whole.   The spring member (4) according to any one of claims 22 to 24, wherein the spring member (4) extends at one switching position to prevent transmission of torque introduced to the output side, and at the other switching position, A drive device that contracts and transmits torque introduced to the drive side.   26. The brake ring (5) according to any one of claims 1 to 25, wherein the brake ring (5) against which the spring member (4) is pressed radially is arranged in the housing (6) of the transmission mechanism so as not to rotate. A drive device characterized by that.   26. The spring member (4) according to claim 24 and 25, wherein the spring member (4) is pressed against the inner wall of the brake ring (5) so as to prevent transmission of torque introduced to the output side at one of the switching positions. The drive device characterized.   28. The drive device according to claim 1, wherein the spring member (4) is formed as a wound spring.

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