Actuating device for actuating a friction clutch, and differential for a motor vehicle

Abstract

The invention relates to an actuating device (1) for actuating a friction clutch (33) of a differential (30), with which a torque distribution from an input (31) to at least one output can be controlled, comprising: a transmission unit (2) for connecting a drive unit (3) of the actuating device (1) to an output unit (4) of the actuating device (1), wherein the transmission unit (2) has a strain wave gearing. The invention also relates to a differential (30) for a motor vehicle comprising an actuating device (1).

Description

[0001] Actuating device for actuating a friction clutch and differential for motor vehicles

[0002] The invention relates to an actuating device for actuating a friction clutch of a differential, with which a torque distribution from one input to at least one output can be controlled. The invention also relates to a differential for a motor vehicle.

[0003] In differentials, such as limited-slip differentials, it is known to use a friction clutch to distribute torque from one input to two outputs. This allows different torques to be directed to different vehicle wheels.

[0004] The friction clutch is typically actuated by means of an actuating device. Known actuating devices or clutch actuating mechanisms are, for example, mechanical via lever mechanisms or hydraulic via a central release bearing. Furthermore, it is known that to transmit the clutch torque and, for example, to overcome a clutch-disengaging spring force via the overall gear ratio, the torque of an electric motor can be used, which heats the electric motor during the actuation period due to the electric current. The clutch actuating force is therefore limited by the permissible temperature rise of the windings of the electric motor.

[0005] Furthermore, conventional actuating devices with multi-stage gears to achieve a high gear ratio can only be used with great effort or not at all in confined spaces.

[0006] Therefore, the object of the present invention is to provide an actuating device for actuating a friction clutch of a differential, with which a torque distribution from one input to at least one output can be controlled, as well as a differential for a motor vehicle, which can be manufactured cost-effectively and with minimal material usage and / or which has a small footprint and / or is robustly designed.

[0007] This problem is solved by the features of the independent claims. Further advantageous embodiments are the subject of the dependent claims. A first aspect of the present invention comprises an actuating device for actuating a friction clutch of a differential, with which a torque distribution from an input to at least one output can be controlled.

[0008] The actuating device includes a transmission unit for connecting a drive unit of the actuating device to an output unit of the actuating device. The output unit can be used to displace a sliding bearing of a friction clutch in a differential. The transmission unit can also include a reduction of torque generated by a drive unit. Furthermore, the output unit can be used to displace a sliding bearing of a friction clutch in a differential.

[0009] Furthermore, the transmission system incorporates a wave gear, also known as a tension wave gear, and / or a cycloidal gear. Both types of gears offer a high gear ratio. This high gear ratio allows for the use of a low-power drive unit or electric motor, and therefore a compact one, to achieve the required torque or disengagement force. A compact drive unit can be axially narrow, thus saving space in the axial direction. In other words, these gear units have a shallow axial depth, for example, of a shaft, and can therefore be used in space-constrained applications. Moreover, these gear units are not self-locking.This is advantageous because, when using the actuating device with a differential equipped with a friction clutch, where the actuating device can open and / or close the friction clutch, the friction clutch can close automatically in the event of a fault. With a wave gear, analogous to a planetary gear, the direction of rotation and gear ratio can be influenced. In this case, gear ratios in the range of i=30 to i=100 are possible. Consequently, the increased gear ratio can increase the clutch force of a differential's friction clutch and / or reduce the self-heating or winding temperature of a drive unit, the actuating device, or an electric motor. Furthermore, it is possible to adjust the clutch force of a differential's friction clutch for a given number of pole pairs.The angular resolution of Hall sensors in a drive unit, actuator, or electric motor can be improved by increasing the gear ratio. Furthermore, increasing the gear ratio can increase the pitch circle diameter of an output gear, a gear on an output shaft of an actuator, or the external teeth of an output shaft, as well as the tooth module, to compensate for tolerances.

[0010] Furthermore, the transmission device can have a transmission input for receiving torque from a drive device of the actuating device.

[0011] The gearbox input can be formed at least partially or entirely by a shaft of a drive unit of the actuating device.

[0012] Furthermore, the gearbox input can include a shaft generator. The shaft generator can be non-rotatably connected to a shaft of a drive unit of the actuating device, e.g., via a shaft-hub connection such as a splined connection. The shaft generator can also be arranged or connected to a shaft of a drive unit of the actuating device with or without play, or with a transition fit.

[0013] Furthermore, the wave generator can be at least partially elliptical in shape. The wave generator can also have a funnel-shaped cross-section.

[0014] The shaft generator can have a first connecting section for a rotationally fixed connection to a shaft of a drive unit of the actuating device. The first connecting section can be annular or hollow cylindrical.

[0015] Furthermore, the wave generator can have a second connecting section that can non-rotatably connect the first connecting section to a transmission section of the wave generator. The second connecting section can be funnel-shaped or, in cross-section, V-shaped and / or cup-shaped. The second connecting section can also provide and / or implement a transition from the first connecting section to a transmission section of the wave generator.

[0016] Furthermore, the shaft generator can have a transmission section for transmitting motion from a shaft of a drive unit of the actuating device to a cylindrical bushing of a gearbox output of the gearbox unit. A rolling bearing of the gearbox input can be arranged on the transmission section. An inner bearing ring of a rolling bearing of the gearbox input can also be arranged on the transmission section. The transmission section can be shaped similarly to a circular ring and / or elliptically and / or similarly to a hollow cylinder.

[0017] The wave generator can have a first connecting section, a second connecting section, and a transmission section, which together can form a funnel shape. The first connecting section can form the narrowest point of the funnel, and the transmission section the widest point.

[0018] Furthermore, the gearbox input can include a rolling bearing. The rolling bearing can be arranged, for example, radially on the outside, on a shaft generator of the gearbox input of the gearbox unit or on its transmission section. The rolling bearing can be positively and / or frictionally connected to a shaft generator of the gearbox input or to its transmission section.

[0019] Furthermore, the rolling bearing or its inner ring can be shrink-fitted onto a shaft generator of the gearbox input or onto its transmission section. It is also possible that the rolling bearing has at least one elastically deformable ring or raceway, such as an inner ring and / or an outer ring, as well as rolling elements. The rolling elements can be arranged between the inner and outer rings or between the shaft generator and the outer ring.

[0020] Furthermore, the transmission device can have a transmission output for transmitting torque from a transmission input of the transmission device.

[0021] The gearbox output can have a cylindrical bushing. The cylindrical bushing can be designed to be elastically deformable.

[0022] The cylindrical bushing can also have external teeth or be externally toothed. The external teeth can mesh with or mesh with the internal teeth of at least one ring gear of the transmission output. Furthermore, the external teeth can have fewer teeth than the internal teeth of at least one ring gear of the transmission output. This allows for a reduction in speed. The difference between the external and internal teeth can be two teeth. Thus, the cylindrical bushing, also called a flexspline, and the at least one ring gear of the transmission output, also called a circular spline, can perform a relative movement of two teeth with each revolution.

[0023] Furthermore, the cylindrical bushing can be designed to engage or mesh with at least one ring gear of the transmission output.

[0024] Furthermore, it may be provided that the cylindrical bushing is arranged on the outside of a rolling bearing of the gearbox input or on an outer bearing ring of a rolling bearing of the gearbox input.

[0025] Furthermore, the cylindrical bushing can form the so-called flexspline of a stress wave gear and / or a wave gear.

[0026] Furthermore, the gearbox output can have at least one ring gear. Additionally, the gearbox output can have a first and a second ring gear, which can be arranged axially consecutively and can have the same inner and / or outer diameter and / or can together form a common ring gear.

[0027] The at least one ring gear may also have internal teeth or be internally toothed. The internal teeth may mesh with external teeth of a cylindrical bushing of the transmission output.

[0028] Furthermore, the internal teeth, e.g., of the second ring gear, can have more teeth than the external teeth of a cylindrical bushing of the transmission output. This allows for a reduction in speed. The difference between the external and internal teeth can be two teeth. Thus, the cylindrical bushing, also called a flexspline, and at least one ring gear of the transmission output, also called a circular spline, can perform a relative movement of two teeth with each revolution.

[0029] Furthermore, the first and second ring gear can be movable or rotatable relative to each other.

[0030] Furthermore, the first ring gear can be non-rotatably connected to a first and / or second housing section of the actuating device. Thus, it can be non-rotatably connected to the housing or to its first and / or second housing section. The first ring gear can be hollow cylindrical and / or have different inner and outer diameters and / or a constant wall thickness.

[0031] The second ring gear can be configured for connection to an output shaft of an output device of the actuating device for moving a sliding bearing of a friction clutch of a differential. Furthermore, the second ring gear can be non-rotatably connected to an output shaft of an output device of the actuating device for moving a sliding bearing of a friction clutch of a differential.

[0032] Furthermore, it is possible that the second ring gear is cup-shaped. The second ring gear can also have at least one recess on the outside of the cup base and / or in the axial direction, the ends of which can each form a support point for an arcuate return spring to generate a restoring torque, and / or in which an arcuate return spring can be arranged to generate a restoring torque, so that the relative position between the second ring gear and a second housing section of the actuating device can be reset to a starting position. The at least one recess can extend along a circular path.

[0033] Furthermore, the second ring gear can have at least one projection that can extend axially into a recess of a second housing section of the actuating device in order to limit the relative angle of rotation of the second ring gear relative to the second housing section in both directions of rotation. Moreover, this prevents rolling elements in a rolling bearing of a sliding bearing of a friction clutch of a differential from rolling against each other by means of the aforementioned angular limitation in the actuating device. Particularly in the case of worn clutch linings of a friction clutch of a differential, it becomes possible to detect clutch wear within the actuating device, e.g., by means of a sensor.

[0034] Furthermore, the actuating device can have a housing with a first and / or second housing section, or a first and / or second housing section in which the gear unit and / or the wave gear and / or the cycloidal gear and / or a shaft generator of the gear input can be arranged. The second housing section can be cup-shaped. It is also possible that the second housing section has at least one projection on the inside of the cup base and / or in the axial direction, which can form a support point for an arcuate return spring to generate a return torque, and / or on which one end of an arcuate return spring can be arranged to generate a return torque, so that the relative position between a second ring gear of the gear output and the second housing section can be reset to an initial position.

[0035] Furthermore, the second housing section can have at least one recess, e.g. on the inside of the pot base, into which a projection of a second ring gear of the gearbox output can axially project in order to limit the relative angle of twist or rotation of the second ring gear to the second housing section in both directions of rotation.

[0036] Furthermore, the actuating device can include an output device for actuating a friction clutch of a differential and / or for converting a rotational motion into an axial motion. The output device can have an output shaft with external teeth. The external teeth can be formed by a gear that may be integrally formed with the output shaft or that may be fixed to the shaft against rotation.

[0037] Furthermore, the output device can be mounted in a second housing section of the actuating device.

[0038] A second ring gear of the gearbox output can also be connected to the output shaft in a rotationally fixed manner.

[0039] Furthermore, it is possible that the output shaft has a receptacle for a shaft of a drive device of the actuating device, such as for a journal of a shaft of a drive device of the actuating device and / or for a rolling bearing for arrangement on a journal of a shaft of a drive device of the actuating device.

[0040] A seal, such as a radial shaft seal, can be arranged between the output shaft and a second housing section of the actuating device.

[0041] This can prevent fluid from escaping the first and / or second housing section. Furthermore, the output device can have at least one return spring for generating a return torque, which may be arc-shaped. The at least one return spring can be arranged between a second housing section of the actuating device and a second ring gear of a transmission output of the transmission device. In addition, the at least one return spring can be located in at least one recess of a second ring gear of a transmission output of the transmission device and bear against it on one side, so that the relative position between a second ring gear of a transmission output of the transmission device and a second housing section of the actuating device can be reset to an initial position.

[0042] Furthermore, the at least one return spring can rest against a projection of a second housing section of the actuating device on one side or with its other, further side, so that the relative position between a second ring gear of a transmission output of the transmission device and a second housing section of the actuating device can be reset to an initial position.

[0043] Furthermore, the actuating device may include a drive unit for generating torque. This drive unit may be designed as an electric motor.

[0044] Furthermore, the actuating device and / or the drive unit can be attached or arranged outside of a friction clutch of a differential for a motor vehicle.

[0045] The drive unit can also be connected to a gearbox input of the gearbox unit in a torque-transmitting manner.

[0046] Furthermore, it may be provided that the drive device has a shaft which is connected to a gear input of the transmission device in a torque-transmitting manner.

[0047] The shaft may have a journal at one end for a rolling bearing, which may be a needle bearing. A rolling bearing may be arranged on the journal as a connecting bearing between the shaft and an output shaft of an actuator, in order to reduce friction between the shaft and the output shaft. In this configuration, the shaft may rotate faster than the output shaft. Furthermore, the journal may have a smaller diameter than the rest of the shaft. The journal, for example, together with a rolling bearing, may also be arranged in a receptacle of an output shaft of an actuator.

[0048] Furthermore, the transmission device can have a transmission input for receiving torque from a drive device of the actuating device.

[0049] The gearbox input can be at least partially eccentric.

[0050] The gearbox input may also include a disc that is eccentrically arranged on a shaft of a drive unit of the actuating device and / or is integrally formed with a shaft of a drive unit of the actuating device. The disc may be an eccentric. Furthermore, the disc may be fixed to a shaft of a drive unit of the actuating device in a rotationally fixed manner.

[0051] Furthermore, the transmission device may be provided with a transmission input for receiving torque from a drive unit of the actuating device.

[0052] The transmission input can have a cam disc with curved sections, which can also be called cams. The cam disc can be arranged on a disk of the transmission input, so that a rotation of the disk causes a rotation of the cam disc.

[0053] Furthermore, the cam disc can have a first receptacle for a gear input disc and / or for a rolling bearing. The first receptacle can be arranged concentrically to the axis of rotation of the cam disc.

[0054] In addition, a rolling bearing can be arranged between the cam disc and the disc.

[0055] Furthermore, the cam disc can have at least one second receptacle for rollers of a roller disc of a gearbox output of the gearbox device in order to establish a power transmission between the roller disc and the cam disc.

[0056] Every second recording can be designed as a passage through the cam disc.

[0057] Several secondary recordings can be arranged in a circle that is concentric with or aligned to the axis of rotation of the cam disc. Furthermore, the transmission device can have a transmission output for transmitting torque from a transmission input of the transmission device.

[0058] The transmission output can have at least one bolt for rolling a cam disk of a transmission input of the transmission device. Several bolts can be arranged in or toward a bolt ring in which a cam disk of a transmission input of the transmission device can roll. The at least one bolt or the bolt ring can be rotationally fixed to a housing or to a second housing section of the actuating device. Alternatively or additionally, the at least one bolt can be formed by a housing or by a second housing section of the actuating device.

[0059] Furthermore, it may be provided that a cam disc of a gearbox input of the gearbox device and the at least one bolt are geometrically matched to each other.

[0060] Furthermore, it is possible that a cam disc of a gearbox input of the gearbox device is adapted on the outside to the at least one bolt, so that the cam disc and the at least one bolt can mesh together.

[0061] Furthermore, the transmission output can have a roller disc as the output. The roller disc can have at least one roller that engages in and / or rolls in at least one second receptacle of a cam disc of a transmission input of the transmission device in order to establish a power transmission between the roller disc and the cam disc.

[0062] Furthermore, the roller disc can be formed by a housing or by a second housing section of the actuating device.

[0063] Furthermore, the roller disc can be connected in a rotationally fixed manner to an output shaft of an output device of the actuating device.

[0064] A second aspect of the present invention comprises a differential for a motor vehicle or for a hybrid or electric motor vehicle.

[0065] It is expressly pointed out that the features of the actuating device, as mentioned under the first aspect, can be used individually or in combination with one another in the differential. In other words, the features relating to the actuating device mentioned above under the first aspect of the invention can also be combined with further features under the second aspect of the invention.

[0066] A differential for a motor vehicle has an input, e.g. connected to an internal combustion engine, and at least one output, e.g. connected to one of the motor vehicle wheels.

[0067] Furthermore, the differential includes an actuating device according to the first aspect for actuating a friction clutch of the differential, with which a torque distribution from the input to the at least one output can be controlled.

[0068] Furthermore, the differential can include a friction clutch for distributing torque from the input to at least one output. The friction clutch can have a housing and / or a sliding bearing, which may be axially acting. The actuating device can be located outside the housing. Thus, the differential can initially be manufactured without the actuating device, reducing complexity and therefore saving costs.

[0069] Furthermore, the actuating device can be arranged on the sliding bearing in such a way that the sliding bearing is axially movable by the actuating device. In this way, the friction clutch can distribute torque from the input to the at least one output.

[0070] Furthermore, it may be provided that the friction clutch or its lamellar package can be actuated using the actuating device, e.g. via the sliding bearing.

[0071] The sliding bearing or one of the bearing rings of the sliding bearing can also be designed, at least partially, in a ramp shape for opening and closing a lamellar pack of the friction clutch.

[0072] Furthermore, it is conceivable that the sliding bearing or one of the bearing rings of the sliding bearing has a toothing that engages in an external toothing of an output shaft of an output device of the actuating device.

[0073] Furthermore, the friction clutch can include a multi-plate clutch pack and / or a pressure plate and / or a pressure pin for actuating the multi-plate clutch pack. The pressure plate and / or the pressure pin can be arranged between the multi-plate clutch pack and the sliding bearing to transmit movement of the sliding bearing to the multi-plate clutch pack.

[0074] The invention is explained in more detail below with reference to an exemplary embodiment in conjunction with a drawing. The drawing schematically shows:

[0075] Fig. 1 shows a sectional view of a differential for a motor vehicle.

[0076] Figure 1 shows a sectional view of a differential 30 for a motor vehicle.

[0077] Figure 1 shows in more detail that the differential 30 has an input 31, e.g. connected to an internal combustion engine, and two outputs (not shown), e.g. connected to a motor vehicle wheel each.

[0078] Furthermore, the differential 30 has an actuating device 1 for actuating a friction clutch 33 of the differential 30, with which a torque distribution from the input 31 to the outputs can be controlled. The actuating device 1 is described in detail below.

[0079] Furthermore, Figure 1 shows that the differential 30 includes a friction clutch 33 for distributing torque from the input 31 to the outputs. The friction clutch 33 has a housing 34 and a sliding bearing 32, which is axially acting. The actuating device 1 is arranged outside the housing 34.

[0080] Furthermore, Figure 1 shows that the actuating device 1 is arranged on the sliding bearing 32 in such a way that the sliding bearing 32 can be axially moved by the actuating device 1.

[0081] The friction clutch 33 or its lamellar package 35 can be actuated via the sliding bearing 32 using the actuating device 1.

[0082] Furthermore, Figure 1 shows that the sliding bearing 32 or one of the bearing rings of the sliding bearing 32 is at least partially ramp-shaped for opening and closing a lamellar pack 35 of the friction clutch 33. The sliding bearing 32 or one of the bearing rings of the sliding bearing 32 also includes a toothed section that engages with an external toothing of an output shaft 21 of an output device 4 of the actuating device 1.

[0083] As already mentioned, the friction clutch 33 has a multi-plate pack 35, a pressure plate 34, and a pressure pin 36 for actuating the multi-plate pack 35. The pressure pin 36 and the pressure plate 34 are arranged between the multi-plate pack 35 and the sliding bearing 32 in order to transmit movement of the sliding bearing 32 to the multi-plate pack 35.

[0084] Figure 1 further shows the actuating device 1 - as already explained - for actuating the friction clutch 33 of the differential 30, with which a torque distribution from one input 31 to two outputs can be controlled.

[0085] The actuating device 1 has a transmission unit 2 for connecting a drive unit 3 of the actuating device 1 to an output unit 4 of the actuating device 1. The sliding bearing 32 of the friction clutch 33 is displaceable by the output unit 4. The transmission unit 2 comprises a reduction of a torque generated by the drive unit 3.

[0086] Furthermore, the transmission unit 3 has a wave gear. The wave gear has a high gear ratio. It also has a shallow depth and can therefore be used in space-constrained areas. In addition, this gear does not self-lock. This is advantageous because, when the actuating device 1 is used with a differential 30 with a friction clutch 33, where the actuating device 1 can open and / or close the friction clutch 33, the friction clutch 33 can close automatically in the event of a malfunction. With a wave gear, the direction of rotation and gear ratio can also be influenced, analogous to a planetary gear. In this case, gear ratios in the range of i=30 to i=100 are possible.

[0087] Furthermore, Figure 1 shows that the transmission device 2 has a transmission input 5 for receiving a torque from a drive unit 3 of the actuating device 1. The transmission input 5 is formed at least partially by a shaft 3A of a drive unit 3 of the actuating device 1.

[0088] Furthermore, the gearbox input 5 has a shaft generator 6 which is rotationally fixed to a shaft 3A of a drive unit 3 of the actuating device 1, e.g. via a shaft-hub connection, such as a splined shaft connection. The shaft generator 6 is arranged or connected to the shaft 3A with or without play, or with a transition fit.

[0089] As shown in Figure 1, the wave generator 6 is at least partially elliptical and funnel-shaped in cross-section.

[0090] Furthermore, the shaft generator 6 has a first connecting section 7 for a rotationally fixed connection with a shaft 3A of a drive unit 3 of the actuating device 1. The first connecting section 7 is designed as annular or hollow cylindrical.

[0091] Furthermore, the wave generator 6 has a second connecting section 8 that connects the first connecting section 7 to a transmission section 9 of the wave generator 6 in a rotationally fixed manner. The second connecting section 8 is funnel-shaped or, in cross-section, V-shaped and / or cup-shaped, whereby the second connecting section 8 forms a transition from the first connecting section 7 to a transmission section 9 of the wave generator 6.

[0092] Furthermore, the shaft generator 6 has a transmission section 9 for transmitting motion from a shaft 3A of a drive unit 3 of the actuating device 1 to a cylindrical bushing 12 of a gearbox output 11 of the gearbox unit 2. The transmission section 9 is elliptical and shaped similarly to a hollow cylinder.

[0093] The first connecting section 7 forms the narrowest point of the funnel and the transmission section 9 the widest point of the funnel.

[0094] As shown in Figure 1, a rolling bearing 10 of the gearbox input 5 is arranged on the transmission section 9. More specifically, an inner ring of a rolling bearing 10 of the gearbox input 5 is arranged on the transmission section 9.

[0095] As already indicated, the gearbox input 5 has a rolling bearing 10, which is arranged radially outside on the shaft generator 6 or on its transmission section 9.

[0096] The rolling bearing 10 is positively and / or frictionally connected to the shaft generator 6 or its transmission section 9. For this purpose, the rolling bearing 10, or its inner bearing ring (not shown), is shrunk onto the shaft generator 6 or its transmission section 9. Furthermore, the rolling bearing 10 has an elastically deformable ring or raceway 10A, such as an outer bearing ring 10A, as well as rolling elements arranged between the inner bearing ring (not shown) and the outer bearing ring 10A, or between the shaft generator 6 and the outer bearing ring 10A.

[0097] Furthermore, Figure 1 shows that the transmission device 2 has a transmission output 11 for transmitting a torque from the transmission input 5.

[0098] The transmission output 11 has a cylindrical bushing 12, which is elastically deformable and has external teeth. The external teeth engage with internal teeth of the ring gears 13, 14 of the transmission output 11 or mesh with internal teeth of the ring gears 13, 14 of the transmission output.

[0099] 11 ,

[0100] The external teeth have fewer teeth than the internal teeth of the ring gears 13, 14 of the transmission output 11. The difference between the external and internal teeth can be two teeth. Thus, the cylindrical bushing performs

[0101] 12, also called Flexspline, and the hollow gears 13, 14 of the gearbox output 11, also called Circular Spline, make a relative movement of two teeth with each revolution.

[0102] As already indicated, the cylindrical bushing 10 is designed to be divided into two hollow gears.

[0103] 13, 14 of the gearbox output 11 to intervene or comb.

[0104] As shown in Figure 1, the cylindrical bushing 12 is arranged on the outside of the rolling bearing 10 or on the outer bearing ring 10A of the rolling bearing 10. As already mentioned, the cylindrical bushing 12 forms the so-called flexspline of the wave gear.

[0105] As shown in Figure 1 and as already mentioned, the transmission output 11 has a first and a second ring gear 13, 14 which are arranged one after the other in the axial direction and have the same inner and outer diameter and together form a common ring gear.

[0106] Each ring gear 13, 14 comprises internal teeth that mesh with the external teeth of the cylindrical bushing 12. As already mentioned, the internal teeth, particularly those of the second ring gear 14, have more teeth than the external teeth of the cylindrical bushing 12. According to Figure 1, the first and second ring gears 13, 14 are movable or rotatable relative to each other, with the first ring gear 13 being rotatably connected to a first and second housing section 17, 18 of the actuating device 1.

[0107] The first ring gear 13 is hollow cylindrical and has different inner and outer diameters, while the second ring gear 14 rotates and is connected or designed to connect to an output shaft 21 of an output device 4 of the actuating device 1 for moving the sliding bearing 32.

[0108] Furthermore, the second ring gear 14 is cup-shaped and has several recesses 15 on the outside of the cup base and in the axial direction, the ends of which each form a support point for an arcuate return spring 24 to generate a return torque. In addition, arcuate return springs 24 can be arranged in the recesses 15 to generate a return torque, so that the relative position between the second ring gear 14 and a second housing section 18 of the actuating device 1 can be reset to a starting position. The recesses 15 extend along a circular path.

[0109] Furthermore, Figure 1 shows that the second ring gear 14 has several projections 16 which extend axially into recesses 20 of a second housing section 18 of the actuating device 1 in order to limit the relative angle of rotation of the second ring gear 14 relative to the second housing section 18 in both directions of rotation.

[0110] Furthermore, as shown in Figure 1, the actuating device 1 has a housing with a first and a second housing section 17, 18. The gear unit 2 or the wave gear or the wave generator 6 of the gear input 5 is arranged in the housing sections 17, 18.

[0111] The second housing section 18 is cup-shaped. Furthermore, it has several projections 19 on the inside of the cup base and in the axial direction. Each projection 19 forms a support point for an arcuate return spring 24 to generate a return torque, and one end of an arcuate return spring 24 is arranged on each projection. Thus, the relative position between the second ring gear 14 of the transmission output 11 and the second housing section 18 can be reset to a starting position. In addition, the second housing section 18 has several recesses 20 on the inside of the cup base, into each of which a projection 16 of the second ring gear 14 of the transmission output 11 projects axially. This allows the relative angle of rotation of the second ring gear 14 to the second housing section 18 to be limited in both directions of rotation.

[0112] As already indicated, the actuating device 1 includes an output device 4 for actuating the friction clutch 33 of the differential 30 and for converting a rotational movement into an axial movement.

[0113] The output device 4 has an output shaft 21 with external teeth formed by a gear 22 which is integrally formed with the output shaft 21.

[0114] Furthermore, the output device 4 is mounted in the second housing section 18 of the actuating device 1, wherein the second ring gear 14 is non-rotatably connected to the output shaft 21.

[0115] Furthermore, the output shaft 21 has a receptacle 21 A for a shaft 3A of a drive unit 3 of the actuating device 1, in particular for a pin 3B of a shaft 3A of a drive unit 3 of the actuating device 1 and for a rolling bearing 23 for arrangement on a pin 3B of a shaft 3A of a drive unit 3 of the actuating device 1.

[0116] Furthermore, Figure 1 shows that a seal 24, such as a radial shaft seal, is arranged between the output shaft 21 and the second housing section 18, which prevents fluid from escaping from the second housing section 18.

[0117] Furthermore, Figure 1 shows that the output device 4 has several return springs 24 for generating a return torque, which are arc-shaped.

[0118] Each return spring 24 is arranged between the second housing section 18 and the second ring gear 14 of the transmission output 11. Furthermore, each return spring 24 rests in a recess 15 of the second ring gear 14 of the transmission output 11 and abuts against it with one side, so that the relative position between the second ring gear 14 and the second housing section 18 can be reset to an initial position. Each return spring 24 also rests against a projection 19 of the second housing section 18 on one side, so that the relative position between the second ring gear 14 and the second housing section 18 can be reset to an initial position.

[0119] As already indicated several times, the actuating device 1 has a drive unit 3 for generating torque. This is designed as an electric motor 3.

[0120] Furthermore, Figure 1 shows that the actuating device 1 can be arranged outside the friction clutch 33 of the differential 30.

[0121] The drive unit 3 is connected to the gearbox input 5 of the gearbox unit 2 in a torque-transmitting manner. Specifically, the drive unit 3 has a shaft 3A which is connected to the gearbox input 5 of the gearbox unit 2 in a torque-transmitting manner. The shaft 3A has a journal 3B at one end for a rolling bearing 23, which is designed as a needle bearing.

[0122] Thus, a rolling bearing 23 is arranged on the pin 3B as a connecting bearing of the shaft 3A with an output shaft 21 of the output device 4 in order to reduce the friction between the faster rotating shaft 3A and the output shaft 21.

[0123] According to Figure 1, the pin 3B has a smaller diameter than the rest of the shaft 3A, with the pin 3B being arranged together with the rolling bearing 23 in a receptacle 21 A of an output shaft 21 of the output device 4.

[0124] List of reference signs

[0125] Actuating device 30 Differential gear unit 31 Input drive unit / electric 32 Sliding bearing motor 33 Friction clutch A Shaft 34 Pressure plate B Pin 35 Plate pack

[0126] Output device 36 Push pin Gear input Shaft generator First connecting section Second connecting section Transmission section 0 Rolling bearing 0A Bearing outer ring 1 Gear output 2 Cylindrical bushing 3 First ring gear 4 Second ring gear 5 Recess 6 Projection 7 First housing section 8 Second housing section 9 Projection 0 Recess 1 Output shaft 1A Mount 2 Gear 3 Rolling bearing - Needle bearing 4 Return spring

Claims

Patent claims 1. Actuating device (1) for actuating a friction clutch (33) of a differential (30), with which a torque distribution from an input (31) to at least one output can be controlled, comprising: - a transmission device (2) for connecting a drive device (3) of the actuating device (1) with an output device (4) of the actuating device (1), characterized in that the transmission device (2) has a wave gear and / or a cycloidal gear.

2. Actuating device according to claim 1 , - wherein the transmission device (2) has a transmission input (5) for receiving a torque from a drive device (3) of the actuating device (1), and - wherein the gearbox input (5) has a shaft generator (6).

3. Actuating device according to claim 1 or 2, - wherein the transmission device (2) has a transmission output (11 ) for transmitting a torque from a transmission input (5) of the transmission device (2), - wherein the transmission output (11) has a cylindrical bushing (12), and - wherein the cylindrical bushing (12) is designed to be elastically deformable.

4. Actuating device according to one of the preceding claims, - wherein the transmission device (2) has a transmission output (11 ) for transmitting a torque from a transmission input (5) of the transmission device (2), - wherein the transmission output (11) has a first and a second ring gear (13, 14) which are arranged consecutively in the axial direction and which have the same inner and / or outer diameter and / or together form a common ring gear, - wherein the first ring gear (13) is connected to a first and / or second housing section (17, 18) of the actuating device (1), and - wherein the second ring gear (14) is connected to an output shaft (21) of an output device (4) of the actuating device (1) for displacing a sliding bearing (32) of a friction clutch (33) of a differential (30).

5. Actuating device according to one of the preceding claims, - wherein the transmission device (2) has a transmission output (11 ) for transmitting a torque from a transmission input (5) of the transmission device (2), - wherein the transmission output (11) has a first and a second ring gear (13, 14) arranged in axial direction and having the same inner and / or outer diameter and / or forming a common ring gear, - wherein the second ring gear (14) has at least one recess (15) on its outer side in the axial direction, the ends of which each form a support point for an arcuate return spring (24) for generating a return torque and / or in which an arcuate return spring (24) can be arranged to generate a return torque, so that the relative position between the second ring gear (14) and a second housing section (18) of the actuating device (1) can be reset to a starting position, and / or - wherein the second ring gear (14) has at least one projection (16) which projects axially into a recess (20) of a second housing section (18) of the actuating device (1) in order to limit the relative angle of rotation of the second ring gear (14) relative to the second housing section (18) in both directions of rotation.

6. Actuating device according to one of the preceding claims, - wherein the actuating device (1) has a housing with a first and / or second housing section (17, 18) or a first and / or second housing section (17, 18) in which the gear unit (2) and / or the wave gear and / or the cycloidal gear and / or a wave generator (6) of the gear input (5) is arranged, - wherein the second housing section (18) has at least one axial projection (19) which forms a support point for an arcuate return spring (24) for generating a return torque and / or on which an end of an arcuate return spring (24) can be arranged to generate a return torque, so that the relative position between a second ring gear (14) of the transmission output (11) and the second housing section (18) can be restored to an initial position, and / or - wherein the second housing section (18) has at least one recess (20) into which a projection (16) of a second ring gear (14) of the transmission output (11) projects axially in order to limit the relative angle of rotation of the second ring gear (14) to the second housing section (18) in both directions of rotation.

7. Actuating device according to one of the preceding claims, - wherein the actuating device (1 ) comprises an output device (4) for actuating a friction clutch (33) of a differential (30) and / or for converting a rotational motion into an axial motion, - wherein the output device (4) has an output shaft (21) with external teeth, and wherein the output shaft (21) has a receptacle (21A) for a shaft (3A) of a drive device (3) of the actuating device (1), and / or wherein the output device (4) has at least one return spring (24) for generating a return torque, and wherein the at least one return spring (24) is located between a second housing section (18) of the actuating device (1 ) and a second ring gear (14) of a transmission output (11 ) of the transmission device (2) is arranged.

8. Actuating device according to one of the preceding claims, - wherein the actuating device (1 ) has a drive unit (3) for generating a torque, - wherein the drive device (3) has a shaft (3A) which is connected to a gear input (5) of the gear device (2) in a torque-transmitting manner, - wherein the shaft (3A) has a journal (3B) at one end for a rolling bearing (23), and - wherein the pin (3B) is arranged in a receptacle (21 A) of an output shaft (21 ) of an output device (4) of the actuating device (1 ).

9. Actuating device according to one of the preceding claims, - wherein the transmission device (2) has a transmission input (5) for receiving a torque from a drive device (3) of the actuating device (1), - wherein the transmission input (5) has a disk which is arranged eccentrically on a shaft (3A) of a drive unit (3) of the actuating device (1) and / or is formed integrally with a shaft (3A) of a drive unit (3) of the actuating device (1), - wherein the transmission input (5) has a cam disk with cam sections, - wherein the transmission device (2) has a transmission output (11 ) for transmitting a torque from a transmission input (5) of the transmission device (2), - wherein the transmission output (11) has at least one bolt for rolling a cam disk of a transmission input (5) of the transmission device (2), and - wherein the gearbox output (11) has a roller disc as the output, - wherein the roller disc has at least one roller which engages in and / or rolls in at least one second receptacle of a cam disc of a transmission input (5) of the transmission device (2) in order to establish a power transmission between the roller disc and the cam disc, - wherein the roller disc is formed by a second housing section (18) of the actuating device (1), and - wherein the roller disc is non-rotatably connected to an output shaft (21) of an output device (4) of the actuating device (1).

10. Comprising a differential (30) for a motor vehicle: - an entrance (31 ), - at least one exit, and - an actuating device (1 ) according to one of the preceding claims for actuating a friction clutch (33) of the differential (30), with which a torque distribution from the input (31 ) to the at least one output can be controlled.

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