Clutch assembly and electric drive train having clutch assembly

Abstract

The invention relates to a clutch assembly (2), comprising a clutch device (3) for coupling a first coupling partner (4) and a second coupling partner (5) in order to rotate the first coupling partner and the second coupling partner together; the invention relates to a clutch device (3) having a slave cylinder (7) for actuating the clutch device (3), the slave cylinder (7) having a cylinder housing (9) and at least one piston (8), the piston (8) being arranged axially displaceable in the cylinder housing (9) about a main axis (100) for the purpose of transmitting an actuating force (103) to the clutch device (3); a clutch housing (12) for accommodating the clutch device (8) and the slave cylinder (7); the invention relates to a clutch assembly (2) for a motor vehicle, comprising a clutch housing (12), a cylinder housing (9), and a fastening device (21) for fastening components of the clutch assembly (2) to the clutch housing (12), the cylinder housing (9) having at least one fastening portion (25) which is held against the clutch housing (12) at least indirectly by the fastening device (21) in a clamping action.

Description

Field of the Invention

[0001] The present invention relates to a clutch assembly having the features of the preamble of claim 1. The present invention also relates to an electric drive train including the clutch assembly. Background Art

[0002] Known clutches are used to engage and disengage an electric motor in a driveline of a motor vehicle. To open and close the clutch, a clutch slave cylinder is required, which has a housing with a pressure chamber in which an axially displaceable piston is guided. The housing of the clutch slave cylinder is in turn screwed to the housing of the clutch assembly via at least two fastening lugs.

[0003] Publication DE 197 55 494 A1 discloses a release device for a hydraulically actuated friction clutch for a vehicle, which release device includes a slave cylinder having a pressure housing that concentrically encloses a drive shaft, in which an annular piston that can be acted upon by a pressure medium is guided in a displaceable manner, on which an actuating bearing supported on the friction clutch is arranged at an end, wherein the pressure housing is releasably screwed to the transmission housing, and for this purpose circumferentially distributed fastening sleeves or fastening holes are provided, the holes of the fastening sleeves or fastening holes serving to receive fastening screws that can be screwed into associated threaded holes in the transmission housing. Each fastening screw has a retaining lock, and the pressure housing is provided with a wall that extends coaxially with the drive shaft and that encloses the actuating bearing in a neutral position, wherein the fastening screws are preferably guided with their screw heads on the wall, which at the same time serves to receive the retaining lock. Summary of the Invention

[0004] The object of the present invention is to provide a clutch assembly having a slave cylinder that is characterized by a particularly simple and cost-effective fastening.

[0005] This object is achieved by a clutch assembly having the features of claim 1 and by an electric drive train having the features of claim 10. Preferred or advantageous embodiments of the present invention result from the dependent claims, the following description, and the drawings.

[0006] The subject matter of the present invention is a clutch assembly that is designed and / or particularly suitable for a driveline of a vehicle, preferably an electric axle. In particular, the clutch assembly is used to interrupt and / or divert the torque path of the driveline. The clutch assembly is preferably used to engage and disengage an electric motor.

[0007] The clutch assembly has a clutch device which is designed and / or adapted to couple a first coupling partner and a second coupling partner so that the first coupling partner and the second coupling partner rotate together. In principle, the clutch device can be designed as a form-fitting clutch, in particular a claw clutch. Alternatively, the clutch device can be designed as a friction clutch, in particular a multi-plate clutch. In principle, the first coupling partner and the second coupling partner can each be designed as a shaft, for example an engine shaft and a transmission shaft arranged coaxially and / or concentrically with respect to a main axis. However, alternatively, one of the two coupling partners can also be designed as a transmission component, for example a gear. The main axis is preferably defined by the axis of rotation of the coupling partners.

[0008] Furthermore, the clutch assembly has a slave cylinder which is designed and / or adapted to operate the clutch device. The slave cylinder is preferably hydraulically actuated. The slave cylinder is particularly preferably designed as a concentric slave cylinder (CSC). In particular, the concentric slave cylinder is designed as a central release unit.

[0009] The slave cylinder has a cylinder housing and at least or exactly one piston, wherein the piston is arranged in the cylinder housing so as to be movable in the axial direction with respect to the main axis in order to transmit an actuating force to the clutch device. In particular, the piston is operatively connected to the clutch device, preferably to an actuating member. The actuating force is preferably to be understood as a compressive force directed axially with respect to the main axis. Preferably, the cylinder housing and the piston delimit a pressure chamber filled with an operating medium. The slave cylinder can be fluid-connected to a hydraulic system which, upon actuation, increases the pressure on the operating medium, wherein the actuating force is generated by the increased pressure in the pressure chamber and is transmitted to the piston. In particular, the pressure chamber is formed by a cylindrical chamber, preferably an annular chamber.

[0010] In particular, the cylinder housing is arranged coaxially and / or concentrically with the main axis. The cylinder housing can be designed as a hollow cylindrical and / or annular housing. The cylinder housing is preferably designed as an annular housing, and the piston is preferably designed as an annular piston, and the annular housing and the annular piston extend concentrically around the main axis. The annular housing preferably has a central through-opening, in particular a hole, through which at least one shaft, for example a motor shaft, can be guided in the case of installation of the slave cylinder.

[0011] The clutch assembly has a clutch housing which is designed and / or adapted to accommodate the clutch device and the slave cylinder. In particular, the clutch housing has a housing chamber, in particular a wet chamber, in which the clutch device and the slave cylinder are arranged. The housing chamber is preferably delimited by the housing wall of the clutch housing in the axial direction with respect to the main axis, wherein the first coupling partner and / or the second coupling partner, in particular a shaft, is guided through the housing wall into the housing chamber.

[0012] Furthermore, the clutch assembly has fastening means which are designed and / or adapted to fasten the components of the clutch assembly, in particular in a detachable manner, to the clutch housing. The fastening means are in particular used to fasten the components form-fittingly and / or force-fittingly to the clutch housing. In principle, the components can be any functional or housing components of the clutch device and / or the slave cylinder which have to be fixed or fastened to the clutch housing in the intended installation situation.

[0013] In the context of the present invention, it is proposed that the cylinder housing has at least or exactly one fastening portion which is held on the clutch housing in a clamped manner by the fastening means at least indirectly. In particular, the fastening portion is held in a clamped manner between the component fastened by the fastening means and the clutch housing in the axial direction and the circumferential direction with respect to the main axis. In particular, the fastening means exerts a clamping force on the fastening portion, wherein a force-fitting connection is formed between the fastening portion and the clutch housing by means of the clamping force. Under the action of the clamping force, at least one fastening portion can be pressed against the clutch housing in the axial direction with respect to the main axis, whereby a friction fit is formed between the fastening portion and the clutch housing, which fixes the cylinder housing against rotation in the circumferential direction with respect to the main axis.

[0014] The present invention is based on the recognition that slave cylinders, in particular concentric slave cylinders, are usually connected to a housing fixed attachment or a clutch housing by two or more screwed-in lug bolts. Depending on the number of screwed-in lugs, the same number of screws are required and, in the case where the cylinder housing is made of plastic, the same number of press-fit sleeves are required.

[0015] The advantage of the present invention is that the cylinder housing enables a particularly simple and cost-effective assembly by means of the clamped attachment of the already installed components of the clutch assembly, wherein cost-intensive additional components such as screws and press-fit sleeves can be dispensed with. Furthermore, a slave cylinder is proposed which is characterized by easy handling and in particular rapid assembly during the assembly process.

[0016] In a specific embodiment, the fastening means has at least or exactly one screw means, wherein the clamping force acting on the fastening portion can be adjusted via the screw means. In particular, the clamping force can be adjusted and / or varied according to the tightening torque of the screw means. For example, the screw means can be tightened to a specific tightening torque to generate a defined clamping force. In particular, the clutch housing has at least or exactly one screw means receiving portion, for example a threaded hole, via which the screw means is or can be mounted on the clutch housing. The clamping force is particularly preferably transmitted to the fastening portion via the component fastened by the fastening means. Thus, a fastening means is proposed which is characterized by variable adjustment of the clamping force.

[0017] In another embodiment, the clutch assembly has a latching device which is designed and / or adapted to latch the piston in at least or exactly one axial piston position. In particular, the piston can be displaced in the axial direction with respect to the main axis between an original position and an actuated position, wherein the latching device latches the piston in the original position and / or the actuated position. For this purpose, the latching device preferably has a latching element, such as a wire loop, which interacts with the piston at least indirectly. For example, the piston is kinematically coupled to the actuating member of the clutch device directly or via a transmission member, such as a pressure reservoir, wherein the latching element can engage with at least one latching profile of the piston or the transmission member or the actuating member.

[0018] According to this embodiment, the latching device is fastened to the clutch housing by fastening means, wherein the fastening part is held clamped in the axial direction with respect to the main axis between the latching device and the clutch housing. In other words, the fastening part bears on the latching device on the one hand and on the clutch housing on the other hand in the axial direction with respect to the main axis. This allows the cylinder housing to be easily attached or held in place on the latching device already mounted on the clutch housing.

[0019] In one embodiment, the latching device is provided with at least or exactly one support plate which is attached to the cylinder housing via fastening means. In particular, the support plate serves for axially supporting and / or accommodating the latching element. Preferably, the latching device has another support plate, wherein the latching element is held between the two support plates in the axial direction with respect to the main axis. For this purpose, the two support plates can be fastened together to the clutch housing via fastening means, preferably screw means, wherein the two support plates are at least partially axially spaced apart from each other to accommodate the latching element.

[0020] According to this embodiment, the support plate provides a support surface in the axial direction with respect to the main axis for axially supporting the fastening part. In particular, the fastening part is supported on the support surface at least sectionally and / or regionally in the axial direction. Preferably, the support plate is fixed to the clutch housing in a form-fitting and / or force-fitting manner by screw means in the axial direction with respect to the main axis. For example, the support plate is designed as a flat sheet metal part which extends substantially in the radial plane of the main axis. The support plate can be designed as a support ring or a support ring segment which is particularly arranged coaxially with the main axis. In other words, the support surface is designed as an annular surface or an annular segment surface of the main axis. In particular, the clamping force can be evenly distributed on the fastening part via the support plate or the support surface. This indicates a particularly firm fastening or clamping of the fastening part.

[0021] In another specific embodiment of the present invention, the clutch housing has a support portion which is designed and / or adapted to support the fastening portion. For this purpose, the support portion provides another support surface in opposite axial directions with respect to the main axis for axially supporting the fastening portion. In particular, the fastening portion is at least partially and / or in sub-regions supported on the other support surface in opposite axial directions. In particular, the support portion is formed by an annular shoulder surrounding the main axis, which annular shoulder extends substantially in the radial plane of the main axis. Preferably, the support surface and the other support surface form two opposite surfaces in the axial direction, and the fastening portion is held between these two opposite surfaces in a clamped manner. Thus, a clutch housing is proposed which is suitable for simply fastening the fastening portion in a clamped manner.

[0022] In a specific embodiment, at least or exactly one fastening portion is arranged on the outer periphery of the cylinder housing, wherein at least one fastening portion is offset outward in the radial direction with respect to the outer periphery with respect to the main axis, thereby forming a radial shoulder. In other words, at least one fastening portion projects from the outer periphery at least in the radial direction and optionally in the axial direction with respect to the main axis. In particular, the cylinder housing has more than two, preferably more than four, particularly more than six fastening portions, wherein the fastening portions are spaced apart in the circumferential direction with respect to the main axis. Preferably, the fastening portions are formed as one piece from a common material section on the base body of the cylinder housing. At least one fastening portion is supported on the support surface of the support plate in the axial direction through an axial end face, and is supported on the other support surface of the clutch housing through a shoulder in the opposite axial direction. Thus, a cylinder housing is proposed which can be easily fixed to the outer periphery of the clutch housing via one or more fastening portions.

[0023] In another improvement, the fastening portion has a clamping geometry on at least or exactly one axial end face, which clamping geometry is designed to be deformable to compensate for tolerances. In particular, the clamping geometry defines an axial dimension oversize with respect to the axial distance between the two support surfaces, whereby in the assembled state a press fit with an oversize dimension of the fastening portion between the two support surfaces is formed. In particular, under the action of a clamping force, the clamping geometry is deformable. Preferably, the clamping geometry deforms or warps during fastening, particularly when tightening at least one screw device. Thus, the clamping geometry allows the clamping of the fastening to be further optimized. The clamping geometry also makes it easy to compensate for tolerances.

[0024] In another embodiment, the clamping geometry is formed by a plurality of clamping lugs aligned in the axial direction with respect to the main axis. In particular, the clamping lugs are formed on the axial end face and / or the shoulder of the fastening part. The clamping lugs are particularly preferably arranged on the axial end face of the fastening part, while the fastening part with a shoulder is preferably placed flat on the entire surface of the clutch housing, particularly on another support surface. Preferably, the clamping geometry has more than two, preferably more than four, particularly more than six clamping lugs. In particular, the clamping lugs can plastically deform during fastening. This ensures a particularly high frictional fit between the cylinder housing and the clutch housing.

[0025] In another embodiment, at least the fastening part, preferably the entire cylinder housing, is made of plastic material. In particular, the fastening part or the cylinder housing is made of a polymer material. Particularly preferably, at least the fastening part is made of a material softer than the support plate and the clutch housing, such that deformation occurs due to the clamping force acting on the fastening part, preferably the clamping geometry. Thus, a cylinder housing is proposed which is characterized by a particularly firm fixation. Additionally, a cylinder housing is proposed which is characterized by a lighter component weight.

[0026] Another object of the present invention relates to an electric powertrain having a clutch assembly as previously described. The electric powertrain is particularly used for generating and / or providing traction torque, particularly main traction torque, for a vehicle. Preferably, the powertrain has an electric machine, particularly an electric motor, which is used for generating and / or providing traction torque. Optionally, the electric powertrain can also have an internal combustion engine, particularly a combustion engine, which is used for providing a greater traction torque for the vehicle.

[0027] Alternatively or optionally, the drive system additionally has a transmission for transmitting the traction torque. For example, the transmission can be designed as a single-stage or multi-stage transmission, a stepped automatic transmission, a dual-clutch transmission, or a continuously variable transmission, such as a CVT transmission.

[0028] Preferably, the electric machine has a first shaft, particularly a motor shaft, which is connected to the electric machine for driving purposes. The internal combustion engine can have a second shaft, particularly another motor shaft, which is connected to the internal combustion engine for driving purposes. The clutch device preferably forms a disconnect clutch for coupling the electric motor to the internal combustion engine. In particular, the disconnect clutch has the function of disengaging the internal combustion engine, such that the electric motor can also be used to drive the vehicle independently of the internal combustion engine.

[0029] Alternatively, the second shaft can form the drive shaft of the transmission, where the second shaft is connected to the transmission for drive purposes. For example, the clutch device can be designed as a three-clutch system, where the clutch device forms the disconnect clutch (K0) or the dual clutch (K1 / K2) of the three-clutch system. In particular, the first clutch and the second clutch (K1 / K2) have the function of engaging or disengaging the combustion engine and / or the electric motor with the transmission as required. Description of the Drawings

[0030] Other features, advantages and effects of the present invention are derived from the following description of the preferred exemplary embodiments of the present invention. In the drawings:

[0031] Figure 1 A schematic cross-sectional view of an electric drive train with a clutch assembly as an exemplary embodiment of the present invention is shown;

[0032] Figure 2 Shows according to Figure 1 A detailed view of the clutch assembly;

[0033] Figure 3 Shows according to Figure 2 A three-dimensional detail view of the cylinder housing of the clutch assembly. Detailed Description of the Invention

[0034] Figure 1 A schematic cross-sectional view of a detailed view of an electric drive train 1 with a clutch assembly 2 as an exemplary embodiment of the present invention is shown. For example, the electric drive train 1 is designed as an electric axle for providing traction torque to a vehicle, for example. The vehicle not shown can be designed as a single-axle or multi-axle and / or single-track or multi-track electric vehicle or hybrid vehicle, for example.

[0035] The clutch assembly 2 has a clutch device 3 for coupling a first coupling partner 4 and a second coupling partner 5 to rotate the first coupling partner and the second coupling partner together. For example, the first coupling partner 4 is designed as the motor shaft of a motor not shown, which is used to generate drive torque, in particular traction torque. For example, the second coupling partner 5 is a gear of a transmission not shown, which is used to transmit drive torque. The first coupling partner 4 and the second coupling partner 5 define a common main axis 100 with their rotational axes, or are arranged coaxially with respect to the main axis 100.

[0036] The clutch device 3 has an actuating member 6 which can be moved in the axial direction with respect to the main axis 100 between an original position 101 and an actuating position 102. The two coupling counterparts 4, 5 are coupled to each other in the original position 101 for common rotation of the two coupling counterparts, and are decoupled from each other in the actuating position 102. For example, the clutch device 2 is designed as a claw clutch, wherein the actuating member 6 is designed as a sliding sleeve through which the two coupling counterparts 4, 5 are or can be engaged with each other.

[0037] To actuate the clutch device 3, the clutch assembly 2 has a hydraulically actuated slave cylinder 7. For example, the slave cylinder 7 is connected via a hydraulic line to a hydraulic system (not shown), wherein the hydraulic actuating force 103 is transmitted via the slave cylinder 7 to the actuating member 6 during actuation to move the actuating member from the original position 101 to the actuating position 102. For example, the slave cylinder 7 is designed as a concentric slave cylinder (CSC) which is arranged coaxial and / or concentric with the main axis 100.

[0038] For this purpose, the slave cylinder 7 has at least one piston 8 designed as an annular piston and a cylinder housing 9 designed as an annular housing, wherein the piston 8 is received in the cylinder housing 9 so as to be displaceable in the axial direction with respect to the main axis 100. The piston 8 and the cylinder housing 9 delimit a pressure chamber 10 which surrounds the main axis 100 and is fluidically connected to the hydraulic system.

[0039] To transmit the actuating force 103, the piston 8 is kinematically coupled to the actuating member 6 via a transmission member 11. The actuating force 103 is to be understood as a compressive force directed in the axial direction 104 with respect to the main axis 100. For example, the transmission member 11 is designed as a pressure tube.

[0040] The clutch assembly 2 includes a clutch housing 12 for accommodating the clutch device 3 and the slave cylinder 7. The clutch housing 12 has a housing chamber 13 which is delimited in opposite axial directions 105 by a housing wall 14 of the clutch housing 12. The clutch device 3 and the slave cylinder 7 are arranged in the housing chamber 13.

[0041] The housing wall 14 has a central opening 15 through which a first coupling counterpart 4 designed as a motor shaft is guided through the housing wall 14 into the housing chamber 13. Additionally, the housing wall 14 has an annular receiving portion 16 in which the cylinder housing 9 designed as an annular housing is received.

[0042] Furthermore, the clutch assembly 2 has a latching device 17 for latching the piston 8 in the original position 101 and / or the actuated position 102. For this purpose, the latching device 17 has a latching element 18 in the form of a wire loop which can engage with a not-shown latching profile, for example formed on the transmission member 11, in the respective piston positions 101, 102.

[0043] The latching device 17 also has a support plate 19 and another support plate 20 which are fastened to the housing wall 14 together via fastening means 21. For this purpose, the fastening means 21 has at least one screw means 22 which is received or screwed into a screw means receiving portion 23, for example a threaded hole, formed in the housing wall 14. The support plates 19, 20 are fastened to the housing wall 14 in opposite axial directions 105 in the outer circumferential region via the screw means 22 and are axially spaced apart from each other in the inner circumferential region, thereby forming a gap 24. The latching element 18 engages in a form-fitting manner in the gap 21 between the two support plates 19, 20.

[0044] The cylinder housing 9 has one or more fastening portions 25 on its outer circumference for fastening the cylinder housing 9 to the clutch housing 12 or the housing wall 14. For this purpose, the fastening portions 25 are arranged in the axial direction with respect to the main axis 100 between the latching device 17 and the fastening portion 12. For this purpose, the fastening means 21 exerts a clamping force 106 on the fastening portion 25 in the opposite axial direction 105, thereby forming a force-fitting connection between the fastening portion 25 and the housing wall 14. For example, the clamping force 106 can be adjusted by the tightening torque of the screw means 22.

[0045] The housing wall 14 has a support portion 26 for axially supporting the fastening portion 25. Thus, in the assembled state, the fastening portion 25 is supported on the support plate 19 in the axial direction 104 and on the support portion 26 of the housing wall 14 in the opposite axial direction 105, wherein a force-fitting connection is formed between the fastening portion 25 and the clutch housing 12 or the housing wall 14 by the clamping force 106.

[0046] Figure 2 A detailed representation of the clutch assembly 2 as indicated in Figure 1 is shown. For example, the support plate 19 is designed as a support ring surrounding the main axis 100, which support ring provides a support surface 27 surrounding the main axis 100 for supporting the fastening portion 17 in the axial direction 104. The support surface 25 extends substantially in the radial plane of the main axis 100.

[0047] For example, the support portion 26 is designed as an annular shoulder surrounding the main axis 100, which provides another support surface 28 surrounding the main axis 100 for supporting the fastening portion 17 in the opposite axial direction 105. The other support surface 28 extends substantially in another radial plane of the main axis 100. Therefore, the two support surfaces 27, 28 should be understood as two axially opposite surfaces, and the fastening portion 25 is accommodated between the two axially opposite surfaces in a clamped manner.

[0048] The fastening portion 25 is offset relative to the outer periphery 29 of the cylinder housing 9 in the radial direction with respect to the main axis 100, thereby forming a radial shoulder 30, wherein the fastening portion 25 together with the shoulder 30 is supported on the support portion 26, in particular the support surface 28, of the housing wall 14.

[0049] Furthermore, the fastening portion 25 has a clamping geometry 32 on the axial end face 31, which is used to compensate for tolerances. Due to the clamping geometry 32, the fastening portion 25 is axially oversized with respect to the axial distance between the two support surfaces 27, 28, wherein the clamping geometry 32 is deformable, in particular plastically deformable, when the latching device 17 is installed by the fastening device 21. For example, for this purpose, the cylinder housing 9 is made of a polymer material. Therefore, in the assembled state, the fastening portion 25 is supported on the support surface 27 in the axial direction 104 by the clamping geometry 32 and on the other support surface 28 in the opposite axial direction 105 by the shoulder 28, thereby forming a friction fit.

[0050] Figure 3 A detailed perspective view of the cylinder housing 9 is shown. The fastening portion 25 is formed in segments in the circumferential direction, wherein the cylinder housing 9 has, for example, a plurality of fastening portions 25 that are evenly spaced apart from each other in the circumferential direction. The clamping geometry 32 is formed by four clamping lugs 33, which are formed on the end face 31 of the fastening portion 25 in the axial direction 104. The clamping lugs 33 are aligned with each other in the same direction, wherein the clamping lugs 33 are supported together on the support surface 27 of the support plate 19 in the assembled state.

[0051] List of reference numerals

[0052] 1 Electric drive train

[0053] 2 Clutch assembly

[0054] 3 Clutch device

[0055] 4 First coupling fitting

[0056] 5 Second coupling fitting

[0057] 6 Actuating member

[0058] 7 slave cylinder

[0059] 8 piston

[0060] 9 cylinder housing

[0061] 10 pressure chamber

[0062] 11 transmission member

[0063] 12 clutch housing

[0064] 13 housing chamber

[0065] 14 housing wall

[0066] 15 opening

[0067] 16 receiving portion

[0068] 17 latching device

[0069] 18 latching element

[0070] 19 support plate

[0071] 20 another support plate

[0072] 21 fastening device

[0073] 22 screw device

[0074] 23 screw device receiving portion

[0075] 24 clearance

[0076] 25 fastening part

[0077] 26 support part

[0078] 27 support surface

[0079] 28 another support surface

[0080] 29 outer periphery

[0081] 30 shoulder

[0082] 31 end face

[0083] 32 clamping geometry

[0084] 33 clamping lug

[0085] 100 main axis

[0086] 101 original position

[0087] 102 actuation position

[0088] 103 actuating force

[0089] 104 Axial direction

[0090] 105 Opposite axial direction

[0091] 106 Clamping force

Claims

1. A clutch assembly (2), - The clutch assembly has a clutch device (3) for coupling a first coupling partner (4) and a second coupling partner (5) to rotate the first coupling partner and the second coupling partner together; - The clutch assembly has a slave cylinder (7) for actuating the clutch device (3), the slave cylinder (7) having a cylinder housing (9) and at least one piston (8), the piston (8) being arranged in the cylinder housing (9) to be movable in the axial direction with respect to the main axis (100) to transmit an actuating force (103) to the clutch device (3); - The clutch assembly has a clutch housing (12) for accommodating the clutch device (8) and the slave cylinder (7); and - The clutch assembly has a fastening device (21) for fastening the components of the clutch assembly (2) to the clutch housing (12), characterized in that the cylinder housing (9) has at least one fastening portion (25), the fastening portion being held on the clutch housing (12) in a clamped manner at least indirectly via the fastening device (21).

2. The clutch assembly (2) according to claim 1, characterized in that, The fastening device (21) has at least one screw device (22), wherein the clamping force (106) acting on the fastening portion (25) can be adjusted via the screw device (22).

3. The clutch assembly (2) according to claim 1 or 2, characterized in that A latching device (17) for latching the piston (8) in at least one axial piston position (101, 102), wherein the latching device (17) is fastened to the clutch housing (12) by the fastening device (21), and wherein the fastening portion (25) is held axially with respect to the main axis (100) in a clamped manner between the latching device (17) and the clutch housing (12).

4. The clutch assembly (2) according to claim 3, characterized in that The latching device (17) has at least one support plate (19) fastened to the cylinder housing (9) via the fastening device (21), wherein the support plate (19) provides a support surface (27) in the axial direction (104) with respect to the main axis (100) for axially supporting the fastening portion (25).

5. The clutch assembly (2) according to any one of the preceding claims, characterized in that, The clutch housing (12) has a support portion (26) for supporting the fastening portion (25), wherein the support portion (26) provides another support surface (27) in the opposite axial direction (105) with respect to the main axis (100) for axially supporting the fastening portion (25).

6. The clutch assembly (2) according to claims 4 and 5, characterized in that, At least one of the fastening portions (25) is arranged on the outer periphery (29) of the cylinder housing (9), wherein the fastening portion (25) is offset relative to the outer periphery (29) in the radial direction with respect to the main axis (100), thereby forming a radial shoulder (30), wherein the fastening portion (25) is supported on the support surface (27) by an end face (31) in the axial direction (104) and on the other support surface (28) by the shoulder (30) in the opposite axial direction (105).

7. The clutch assembly (2) according to any one of the preceding claims, characterized in that, The fastening portion (25) has a deformable clamping geometry (32) on at least one axial end face (31) to compensate for tolerances.

8. The clutch assembly (2) according to claim 7, characterized in that, The clamping geometry (32) is formed by a plurality of clamping lugs (33) axially aligned with respect to the main axis (100).

9. The clutch assembly (2) according to any one of the preceding claims, characterized in that, The fastening portion (25) is made of plastic.

10. An electric powertrain (1) having a clutch assembly (2) according to any one of the preceding claims.

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