DE102019133751A1 - Clutch unit, in particular for a hybrid module, for damped coupling of an internal combustion engine to a drive train of a motor vehicle - Google Patents

Abstract

A clutch unit (10), in particular for a hybrid module (60), is provided for the damped coupling of an internal combustion engine to a drive train of a motor vehicle with a torsional vibration damper (12) for damping rotational irregularities, a driver ring (26) connected to the torsional vibration damper (12). for discharging the damped torque and a torque-transmitting coupling (32) coupled to the driver ring (26) for the optional transmission of the damped torque to a shaft (64), the driver ring (26) being designed as an axially flexible transmission disk. The axially flexible driver ring (26) enables a coupling unit (10) with good damping properties that saves space and is easy to assemble.

Description

The invention relates to a clutch unit provided in particular for a hybrid module, with the aid of which an internal combustion engine can be coupled to a drive train, in particular of a hybrid motor vehicle, in a damped manner.

Out DE 10 2009 059 944 A1 a clutch assembly of a hybrid module for a drive train of a vehicle is known, a wet multi-plate clutch of the hybrid module being arranged in the torque flow between an internal combustion engine and an electric motor arranged coaxially to the hybrid module.

There is a constant need for a space-saving and easy to assemble coupling unit with good damping properties.

It is the object of the invention to indicate measures that enable a space-saving and easy-to-assemble clutch unit with good damping properties.

The object is achieved according to the invention by a clutch unit with the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and the following description, each of which can represent an aspect of the invention individually or in combination.

According to the invention, a clutch unit, in particular for a hybrid module, is provided for the damped coupling of an internal combustion engine to a drive train of a motor vehicle with a torsional vibration damper for damping rotational irregularities, a driving ring connected to the torsional vibration damper for diverting the damped torque and a separating clutch coupled to the driving ring for optional torque transmission Transmission of the damped torque to a shaft, the driver ring being designed as an axially flexible transmission disk.

The at least one transmission disk of the driver ring is designed to be sufficiently rigid in the circumferential direction in order to be able to transmit a designated maximum torque without plastic deformation. At the same time, the transmission disk is sufficiently elastically deformable in the axial direction that, when axial forces occur, a radially outer edge of the transmission disk can perform an axial offset relative to a radially inner edge of the transmission disk. The transmission disk, also known as a “flexplate”, is able to yield elastically in the axial direction compared to the rigid components of the torsional vibration damper and the separating clutch. As a result, the at least one transmission disk of the driver ring can compensate for axial vibrations that can be introduced into the torsional vibration damper of the clutch assembly, for example, via a drive shaft of the internal combustion engine designed in particular as a crankshaft. An offset of components that are movable relative to one another and interacting with one another, caused by otherwise occurring axial forces, can thereby be avoided. Damage to downstream components in the torque flow, in particular a motor vehicle transmission and / or the separating clutch, by axial vibrations can be prevented. Since the clutch unit can dampen not only torsional vibrations, but also axial vibrations due to the axially flexible driving ring, the damping properties of the clutch unit are improved.

Since the driver ring is not rigid, but is designed to be axially flexible, in that its structure is based on the design of a flexplate, the damping of axial vibrations can be provided in a manner that is essentially space-neutral. It is even possible that the axial space requirement is reduced by reducing the material thickness of the driver ring. In addition, a separation point between the torsional vibration damper on the one hand and the separating clutch on the other hand can easily be formed with the aid of the driver ring. As a result, the torsional vibration damper and the separating clutch can be installed one after the other as separate structural units in a hybrid module and / or in a drive train of the motor vehicle and connected to one another via an axial relative movement during assembly. For example, the driver ring is coupled to the torsional vibration damper or to the separating clutch via a torque-transmitting but axially relatively displaceable coupling device, in particular in the form of a plug-in toothing. Particularly preferably, the driver ring is firmly connected to an output side of the torsional vibration damper, in particular riveted, so that the coupling device with the separating clutch can be formed on a larger radius than a fastening point of the driver ring to the torsional vibration damper. As a result, a particularly large number of force transmission points can be provided in the circumferential direction between the driver ring and the separating clutch, as a result of which a correspondingly high torque can be transmitted. The driver ring can extend radially outward from the fastening point with the torsional vibration damper and optionally also in the axial direction away from the torsional vibration damper, in particular cranked, in order to be easily coupled to the separating clutch. Due to the axially flexible driving ring, there is a Space-saving and easy to assemble coupling unit with good damping properties.

In particular, the driver ring has at least one collar section protruding in the axial direction for attachment to the separating clutch, with at least one attachment opening for receiving a radially oriented attachment means being provided in the collar section. The collar section can be designed, for example, as a bent flat tab or as a bent ring section. As a result, the collar section can easily be produced by non-cutting deformation. Due to the collar section protruding in the axial direction, the coupling of the driver ring with the separating clutch can be carried out by radially aligned fastening means, so that it is easily possible during assembly to grip the fastening means laterally past the torsional vibration damper in the axial direction with a tool, for example a screwdriver, to bring about or cancel the coupling of the driver ring with the separating clutch. The assemblability and ease of maintenance are improved as a result.

The fastening opening is preferably designed to be open in the axial direction towards the separating clutch. This makes it possible to preassemble the fastening means in the separating clutch and, in the preassembled state, bring about the coupling of the driver ring to the separating clutch. For example, the fastening means oriented in the radial direction is only partially screwed into the separating coupling, so that a screw shaft of the fastening means can be threaded into the fastening opening when the separating coupling moves axially relative to the torsional vibration damper. The fastening means can then be tightened so that there is a motion-proof connection between the driver ring and the separating clutch.

Particularly preferably, the fastening opening in the axial direction towards the separating clutch has at least one insertion bevel for threading in the radially oriented fastening means of the separating clutch. Threading the fastening means into the fastening opening is facilitated by the lead-in bevel, so that, in principle, blind assembly of the coupling unit is also made possible by an axial movement of the separating coupling relative to the torsional vibration damper.

In particular, the separating clutch has an axially fixed counter-plate and a pressure plate, which can be axially displaced relative to the counter-plate, for frictionally locking a clutch disc that can be coupled to a shaft between the counter-plate and the pressure plate, the fastening means for fastening the driver ring being fastened, in particular screwed, to the counter-plate wherein, in particular, the counter plate has a fastening section protruding in the axial direction and encompassing the clutch disc at least partially radially outside for fastening the fastening means. The counter plate is supported axially on the shaft, for example. In particular, the counter plate is mounted on the shaft via a bearing and is supported on the shaft in the radial direction and in the axial direction. Forces occurring on the counter plate can thus be easily transferred to the shaft. Due to the fastening section bent in the axial direction, the driving ring can be fastened with the separating clutch at a sufficient distance from the torsional vibration damper in order to create good accessibility of the fastening means for a tool. The fastening section can preferably form an axial guide for the pressure plate, so that the pressure plate is well guided without significant tilting and / or a torque can also be transmitted from the pressure plate to the clutch disc.

The driver ring preferably has a stiffening bead and / or a weakening recess. By suitably designing the transmission disk of the driver ring, in particular the spring properties of the transmission disk, in particular the spring characteristic of the transmission disk, can be adapted to the desired profile of requirements for the driver ring.

Particularly preferably, the driver ring has a plurality of transmission disks which are arranged directly one behind the other in the axial direction and are in particular of identical design. The respective transmission disk can be manufactured inexpensively from a comparatively thin sheet steel, in particular by punching. Via the number of multiple transmission disks placed one on top of the other to form a package, the properties with regard to the torque to be transmitted and / or the axial flexibility can be easily adapted to different drive trains. This enables cost-effective production of the transmission disks across series.

In particular, the torsional vibration damper has a dual-mass flywheel for damping rotational irregularities and a centrifugal pendulum for generating a restoring torque opposing rotational irregularity in the torque to be transmitted, the dual-mass flywheel limiting a primary mass that can be connected to a drive shaft of the internal combustion engine and an energy storage element designed in particular as an arc spring relatively rotatable coupled to the primary mass Having secondary mass, wherein the centrifugal pendulum is formed radially inside to the energy storage element on the, in particular designed as an output flange, secondary mass. The dual-mass flywheel and the centrifugal pendulum can cause torsional vibration damping in different frequency ranges, whereby a high damping effect can be achieved. If the separating point between the torsional vibration damper and the separating clutch is formed between the driver ring and the separating clutch, sufficient installation space for the centrifugal pendulum can be provided radially inside the energy storage element. The secondary mass of the dual-mass flywheel, which is in particular designed as an output flange, preferably forms a carrier flange for the centrifugal pendulum, on which the pendulum masses of the centrifugal pendulum are guided in a pendulum fashion.

In a pulling mode, the torque coming from the internal combustion engine can be introduced into the primary mass of the dual-mass flywheel, while in a pushing mode the torque coming from the drive train can be introduced into the secondary mass The torque coming from the internal combustion engine can be introduced into the secondary mass, while in overrun mode the torque coming from the drive train can be introduced into the primary mass. The primary mass and the secondary mass, which is coupled to the primary mass so that it can rotate to a limited extent via the energy storage element, in particular designed as an arc spring, can form a mass-spring system that can dampen rotational irregularities in the speed and torque of the drive power generated by a motor vehicle engine in a certain frequency range. The mass moment of inertia of the primary mass and / or the secondary mass and the spring characteristic of the energy storage element can be selected in such a way that vibrations in the frequency range of the dominant engine orders of the motor vehicle engine can be dampened. The mass moment of inertia of the primary mass and / or the secondary mass can in particular be influenced by an attached additional mass. The primary mass can have a disk to which a cover can be connected, as a result of which a substantially annular receiving space for the energy storage element can be delimited. The primary mass can, for example, tangentially strike the energy storage element via impressions protruding into the receiving space. An output flange of the secondary mass, which can tangentially strike the opposite end of the energy storage element, can protrude into the receiving space.

Under the influence of centrifugal force, the at least one pendulum mass of the centrifugal pendulum strives to assume a position as far away as possible from the center of rotation. The “zero position” is therefore the position furthest radially from the center of rotation, which the pendulum mass can assume in the radially outer position. At a constant drive speed and constant drive torque, the pendulum mass will assume this radially outer position. In the event of speed fluctuations, the pendulum mass deflects along its pendulum path due to its inertia. The pendulum mass can thereby be shifted in the direction of the center of rotation. The centrifugal force acting on the pendulum mass is divided into a component tangential and a further component normal to the pendulum path. The tangential force component provides the restoring force that wants to bring the pendulum mass back into its "zero position", while the normal force component acts on a force introduction element that initiates the speed fluctuations, in particular the primary mass or the secondary mass, and there generates a counter-torque that counteracts the speed fluctuation and the initiated speed fluctuations dampen. In the case of particularly strong fluctuations in speed, the pendulum mass can therefore have swung out to the maximum and assume the radially most inner position. The tracks provided in the carrier flange and / or in the pendulum mass have suitable curvatures for this purpose, in which a coupling element, in particular designed as a roller, can be guided. At least two rollers are preferably provided, each of which is guided on a track of the carrier flange and a pendulum track of the pendulum mass. In particular, more than one pendulum mass is provided. A plurality of pendulum masses are preferably guided on the carrier flange in a uniformly distributed manner in the circumferential direction. The inert mass of the pendulum mass and / or the relative movement of the pendulum mass to the carrier flange is designed in particular to dampen a certain frequency range of rotational irregularities, in particular an engine order of the motor vehicle engine. The pendulum mass can be produced inexpensively by a package of pendulum plates stacked on top of one another and connected to one another, wherein in particular the preferably identically shaped pendulum plates can be produced by punching from a metal sheet. In particular, more than one pendulum mass and / or more than one carrier flange is provided. For example, two pendulum masses connected to one another via bolts or rivets designed in particular as spacer bolts are provided, between which the carrier flange is positioned in the axial direction of the torsional vibration damper. Alternatively, two flange parts of the carrier flange, in particular connected to one another in a substantially Y-shape, can be used be provided, between which the pendulum mass is positioned.

An axially flexible primary transmission disk for fastening the primary mass to the drive shaft is preferably fastened to the primary mass. The primary transmission disk can also be designed analogously to a flexplate. The damping capacity for damping axial vibrations is thereby further improved. In addition, it is possible for the primary side of the torsional vibration damper to follow an axial vibration in the axial direction due to the axially flexible primary transmission disk and the secondary side of the torsional vibration damper due to the axially flexible driver ring. An axial offset between the primary mass and the secondary mass in the event of an axial oscillation, which could be problematic in particular for the energy storage element due to the changing force application points, is thereby avoided. Instead, it is possible that, due to the axial flexibility of the primary transmission disk and the driver ring, the dual-mass flywheel is designed to vibrate as a whole in the block in a damped manner in the event of an axial vibration.

The invention also relates to a hybrid module for coupling an electric machine to a hybrid drive train of a hybrid motor vehicle with a clutch unit, which can be designed and developed as described above, for the optional introduction of a vibration-damped torque of an internal combustion engine, one coupled to the clutch unit in a torque-transmitting manner Shaft for transmitting the torque to a transmission input shaft and / or to a double clutch for coupling two different transmission input shafts and the electrical machine, the electrical machine having a rotor coupled to the shaft. The axially flexible driving ring enables a space-saving and easy-to-assemble hybrid module with good damping properties.

• 1: eine schematische Schnittansicht eines Kupplungsaggregats,
• 2: eine schematische perspektivische Ansicht eines Mitnehmerrings des Kupplungsaggregats aus 1 und
• 3: eine schematische Schnittansicht eines Hybridmoduls mit dem Kupplungsaggregat aus 1.

In the following, the invention is explained by way of example with reference to the attached drawings using preferred exemplary embodiments, the features shown below being able to represent an aspect of the invention both individually and in combination. Show it:

• 1 : a schematic sectional view of a clutch unit,
• 2 : a schematic perspective view of a driver ring of the clutch assembly from 1 and
• 3rd : a schematic sectional view of a hybrid module with the clutch unit from 1 .

This in 1 shown clutch unit 10 can be introduced in a drive train of a motor vehicle via a drive shaft of a motor vehicle engine torsional vibrations in the transmitted torque with the help of a torsional vibration damper 12th dampen. The torsional vibration damper 12th a dual mass flywheel 14th on that a primary mass 16 and an energy storage element designed as a bow spring 18th coupled secondary mass that can be rotated to a limited extent 20th having. The primary mass 16 has a welded-on lid 22nd on, creating a recording room 24 is partially limited in which the energy storage element 18th is added lubricated with grease. With the secondary mass designed as an output flange 20th is a driving ring 26th riveted, which transmits torque with a separating clutch designed as a friction clutch 32 is coupled, the part of the coupling unit 10 is. The primary mass 16 is via a primary transmission disk designed as an axially flexible flexplate 28 connected to the drive shaft of the internal combustion engine.

At the secondary ground 20th is also a centrifugal pendulum 34 formed that also within the receiving space 24 is arranged. The centrifugal pendulum 34 is here radially inside to the energy storage element 18th partially or completely in a common axial area with the energy storage element 18th positioned so that the energy storage element viewed in the radial direction 18th the centrifugal pendulum 34 to a large extent, in particular completely, can cover. The centrifugal pendulum 34 has on both axial sides of a carrier flange, which in the present exemplary embodiment is formed by the secondary mass formed as an output flange 20th is formed, several pendulum masses evenly distributed one behind the other in the circumferential direction 36 on that with the help of suitably curved paths in the pendulum masses 36 and the carrier flange are guided in a swingable manner. To the recording room 24 to be sealed is with the secondary mass 20th a sealing membrane designed in the manner of a disc spring 38 riveted with a spring preload via a sliding ring 40 relatively rotatable on the lid 22nd the primary mass 16 is axially supported. In addition, is between the secondary mass 20th and the primary mass 16 or one with the primary mass 16 connected centering element 42 a plain bearing is formed, which in particular also includes the receiving space 24 can seal.

The disconnect clutch 32 has a counter plate 44 and one relative to the backplate 44 axially displaceable pressure plate 46 to in the closed state of the disconnect clutch 32 a clutch disc 30th to be frictionally pressed. The pressure plate 46 can on one of the counter plate 44 trained fastening section 48 axial be guided and are automatically moved into a designated axial starting position by a return spring designed as a leaf spring, via which a torque can also be transmitted. In the fastening section 48 is also a fastening means designed as a screw 50 screwed in radial alignment. The fastener 50 fastened a collar portion bent in the axial direction 52 of the driver ring 26th with the counter plate 44 the disconnect clutch 32 .

As in 2 is shown is the driver ring 26th designed as a flexible flexplate that is flexible in the axial direction. In order to be sufficiently soft in the axial direction, the driver ring 26th several weakening recesses 54 on. In the collar section 52 of the driver ring 26th are axially open fastening openings 56 provided by the respective fastening means 50 can be passed through. The mounting holes 58 have lead-in chamfers 58 on, so that when coupling the torsional vibration damper 12th with the disconnect clutch 32 during assembly by an axial relative movement with the fastening section 48 the counter plate 44 partially screwed in fasteners 50 easily into the mounting holes 58 Can be threaded before the fasteners 50 get dressed by.

As with the in 3rd illustrated hybrid module 60 can be seen, is to operate the disconnect clutch 32 a hydraulically operated actuation system 62 intended. One with the clutch disc 30th non-rotatably coupled shaft 64 is with a rotor 66 an electric machine 68 non-rotatably connected and via a double clutch 70 with a first transmission input shaft 72 and / or a second transmission input shaft 74 a motor vehicle transmission can be coupled. The double clutch 70 has for this purpose two designed as multi-plate clutches with the respective transmission input shaft 72 , 74 cooperating partial couplings.

List of reference symbols

10

Clutch unit

12th

Torsional vibration damper

14th

Dual mass flywheel

16

Primary mass

18th

Energy storage element

20th

Secondary mass

22nd

cover

24

Recording room

26th

Drive ring

28

Primary transmission pulley

30th

Clutch disc

32

Disconnect clutch

34

Centrifugal pendulum

36

Pendulum mass

38

Sealing membrane

40

Slip ring

42

Centering element

44

Counter plate

46

Pressure plate

48

Fastening section

50

Fasteners

52

Collar section

54

Recess

56

Mounting hole

58

Lead-in slope

60

Hybrid module

62

Actuation system

64

wave

66

rotor

68

electric machine

70

Double coupling

72

first transmission input shaft

74

second transmission input shaft

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102009059944 A1 [0002]

Claims (10)

Clutch unit, in particular for a hybrid module (60), for the damped coupling of an internal combustion engine to a drive train of a motor vehicle a torsional vibration damper (12) to dampen rotational irregularities, a driver ring (26) connected to the torsional vibration damper (12) for discharging the damped torque and a torque-transmitting coupling (32) coupled to the driver ring (26) for the optional transmission of the damped torque to a shaft (64), wherein the driver ring (26) is designed as an axially flexible transmission disk. Clutch unit according to Claim 1 characterized in that the driver ring (26) has at least one axially protruding collar section (52) for attachment to the separating clutch (32), with at least one attachment opening (56) in the collar section (52) for receiving a radially oriented attachment means (50) ) is provided. Clutch unit according to Claim 2 characterized in that the fastening opening (56) is designed to be open in the axial direction towards the separating clutch (32). Clutch unit according to Claim 3 characterized in that the fastening opening (56) in the axial direction towards the separating clutch (32) has at least one insertion bevel (58) for threading in the radially oriented fastening means (50) of the separating clutch (32). Clutch unit according to one of the Claims 1 to 4th characterized in that the separating clutch (32) has an axially fixed counter plate (44) and a pressure plate (46) which can be axially displaced relative to the counter plate (44) for frictionally locking a clutch disc (30) which can be coupled to a shaft (64) between the counter plate ( 44) and the pressure plate (46), the fastening means (50) for fastening the driver ring (26) being fastened, in particular screwed, to the counterplate (44), in particular the counterplate (44) having one protruding in the axial direction and the Clutch disc (30) has at least partially radially outside encompassing fastening section (48) for fastening the fastening means (50). Torsional vibration damper according to one of the Claims 1 to 5 characterized in that the driver ring (26) has a stiffening bead and / or a weakening recess (54). Torsional vibration damper according to one of the Claims 1 to 6th characterized in that the driver ring (26) has a plurality of transmission disks which are arranged directly one behind the other in the axial direction and are in particular of identical design. Clutch unit according to one of the Claims 1 to 7th characterized in that the torsional vibration damper (12) has a dual-mass flywheel (14) for damping rotational irregularities and a centrifugal pendulum (34) for generating a restoring torque counter to rotational irregularity in the torque to be transmitted, the dual-mass flywheel (14) having a drive shaft of the internal combustion engine connectable primary mass (16) and a secondary mass (20) coupled to the primary mass (16) in a limited, relatively rotatable manner via an energy storage element (18) designed in particular as an arc spring, the centrifugal pendulum (34) radially inwardly towards the energy storage element (18) the secondary mass (20), in particular designed as an output flange, is formed. Clutch unit according to Claim 8 characterized in that an axially flexible primary transmission disk (28) for fastening the primary mass (16) to the drive shaft is fastened to the primary mass (16). Hybrid module for coupling an electric machine (68) to a hybrid drive train of a hybrid motor vehicle, with a clutch unit (10) according to one of the Claims 1 to 9 for optionally introducing a vibration-damped torque of an internal combustion engine, a shaft (64) coupled to the clutch unit (10) in a torque-transmitting manner for transmitting the torque to a transmission input shaft and / or to a double clutch (70) for coupling two different transmission input shafts (72, 74) and the electrical machine (68), the electrical machine (68) having a rotor (66) coupled to the shaft (64).

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