DE102019113156A1 - Clutch unit - Google Patents

Abstract

A coupling unit (10) is provided for coupling a motor shaft of an internal combustion engine to a rotor of an electrical machine with a dual-mass flywheel (14) for damping torsional vibrations, the dual-mass flywheel (14) having a primary mass (16) that can be directly or indirectly connected to the motor shaft has a secondary mass (24) which can be rotated to a limited extent via an energy storage element (20), in particular designed as a bow spring, the secondary mass (24) having an output flange (22) that can be tangentially abutted on the energy storage element (20), and one, in particular designed as a plate coupling Friction clutch (28) for coupling the secondary mass (24) to the rotor of the electrical machine, the output flange (22) forming a friction surface (26) for frictional contact with an axially displaceable clutch disc (34) of the friction clutch (28) that can be coupled to the rotor . By integrating the output flange (22) as a friction partner in the friction clutch (28), otherwise free installation space of the dual mass flywheel (14) can be used for the friction clutch (28), so that a hybrid module with a small installation space requirement is possible.

Description

The invention relates to a clutch unit with the aid of which, in particular within a hybrid module, an internal combustion engine and / or an electric machine can be coupled to a motor vehicle transmission.

Out DE 10 2009 059 944 A1 A hybrid module for a drive train of a vehicle is known, with a wet multi-plate clutch of the hybrid module in the torque flow between an internal combustion engine and an electric motor arranged coaxially to the hybrid module and another wet multi-disc clutch of the hybrid module being arranged in the torque flow between the electric motor and a motor vehicle transmission in the drive train. A dual-mass flywheel and a centrifugal pendulum for torsional vibration damping are coupled in the direction of force flow between the multi-plate clutches.

There is a constant need to reduce the installation space of hybrid modules.

It is the object of the invention to show measures that enable a hybrid module with a small footprint.

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 for coupling a motor shaft of an internal combustion engine to a rotor of an electrical machine is provided with a dual-mass flywheel for damping torsional vibrations, the dual-mass flywheel having a primary mass that can be directly or indirectly connected to the motor shaft and an energy storage element that can be rotated to a limited extent via an energy storage element designed in particular as an arc spring Having secondary mass, the secondary mass having an output flange that can be tangentially abutable on the energy storage element, and a friction clutch, in particular designed as a plate clutch, for coupling the secondary mass to the rotor of the electrical machine, the output flange having a friction surface for frictional contact with an axially couplable with the rotor Movable clutch disc forms the friction clutch.

The friction clutch can couple a motor shaft of an internal combustion engine to an intermediate shaft to which the rotor of the electrical machine is coupled. In particular, the intermediate shaft already represents a rotor shaft connected in a rotationally fixed manner to the rotor. The intermediate shaft in turn can be coupled to at least one transmission input shaft of a motor vehicle transmission. Due to the way in which the torque is generated in the internal combustion engine, the motor shaft can have rotational irregularities which are intended to be damped by the dual mass flywheel. This makes use of the knowledge that the energy storage element for damping the rotational irregularities in the torque coming from the internal combustion engine should be operated in a frequency range in which the energy storage element must be made as long as possible and therefore, for example in the form of an arc spring, on as large a frequency as possible Radius should be arranged. As a result, installation space can be created radially within the energy storage element which can be used at least partially by the friction clutch. The friction clutch can thereby be positioned axially offset to the electrical machine, so that the installation space around the intermediate shaft can be used for other components. In particular, it is possible to couple the intermediate shaft to a first transmission input shaft and / or a second transmission input shaft of a double clutch transmission via a double clutch, which has in particular two, preferably wet, multi-plate clutches, despite otherwise tight installation space conditions. As a result of the friction clutch shifted around the intermediate shaft from the installation space required for the double clutch, installation space can be saved in the area of the electrical machine and a double clutch that is structurally simple to implement can be provided. In addition, the friction clutch can use the otherwise free installation space of the dual-mass flywheel, so that the axial installation space requirement can be reduced. Since the output flange of the secondary mass simultaneously forms a counterplate of the friction clutch so that the clutch disc can be pressed against the friction surface of the output flange, a separate counterplate can be saved, which additionally reduces the axial installation space requirement. By integrating the output flange as a friction partner in the friction clutch, otherwise free installation space of the dual mass flywheel can be used for the friction clutch, so that a hybrid module with a small installation space requirement is made possible.

In a pulling mode, the torque coming from a motor vehicle engine can be introduced into the primary mass, while in a pushing mode the torque coming from the drive train can be introduced into the secondary mass, whereby the reverse installation is also possible, in a pulling mode that of the motor vehicle engine coming torque in the secondary mass can be introduced, while the torque coming from the drive train can be introduced into the primary mass in overrun mode. The primary mass and the secondary mass, which is coupled to the primary mass in a limitedly rotatable manner 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 rotational speed and in the 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 ring-shaped 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 can protrude into the receiving space, which flange can tangentially strike the opposite end of the energy storage element.

In particular, the friction surface is provided in a radius region of the output flange that is bent away from the rotor. A gap that arises between the primary mass and the output flange can thereby be minimized, as a result of which the installation space that can be used for the friction clutch, in particular radially inside the energy storage element, can be increased. As a result, the friction clutch can be nested to a greater extent in the axial direction in the dual-mass flywheel, as a result of which the axial installation space requirement can be further reduced.

A clutch cover is preferably connected to the output flange to axially, in particular pivotably, support an actuating element, in particular designed as a lever spring pivotable about a pivot axis running in the circumferential direction, for displacing a pressure plate for axially pressing the clutch disc between the pressure plate and the output flange. The clutch cover connected to the output flange of the secondary mass, in particular radially inside to the energy storage element, can easily be guided past the energy storage element. The components of the friction clutch can be retained between the output flange and the clutch cover in a captive manner. In particular, the output flange and the friction clutch can be installed quickly and inexpensively as a common preassembled structural unit in the clutch unit. The axial forces occurring in the friction clutch can be absorbed on the one hand by the output flange and on the other hand by the clutch cover and can be mutually supported.

Particularly preferably, the primary mass and / or the secondary mass delimit an annular receiving space for receiving the energy storage element, a relatively rotatable sealing membrane that can be slid off the primary mass to seal off the receiving space from the friction clutch with the output flange, in particular the sealing membrane and the clutch cover being connected via a common fastening means are fastened to the output flange. In particular, a lubricant, for example lubricating grease, is provided in the receiving space, with the aid of which the energy storage element can be lubricated. The receiving space can be sealed by the sealing membrane to such an extent that the lubricant cannot reach the friction clutch, which can thus be operated dry and with a high coefficient of friction compared to a wet and / or lubricated friction clutch. A sudden drop in the maximum possible torque to be transmitted by the friction clutch due to lubricant accidentally getting into the friction clutch can thereby be avoided.

In particular, the clutch disc has an output hub for rotationally fixed but axially displaceable coupling with the rotor of the electrical machine, the output hub having at least one assembly opening for introducing a tool for fastening the primary mass to an input shaft with the aid of a connecting means. The axially displaceable clutch disc can be coupled non-rotatably to the intermediate shaft via the output hub. The assembly opening can ensure that the primary mass can be attached directly or indirectly to a motor shaft, in particular crankshaft, of the internal combustion engine during assembly of the clutch unit. The friction pairings of the friction clutch can here be provided radially outside of the assembly opening.

The primary mass preferably has at least one fastening opening for fastening the primary mass to an input shaft with the aid of a connecting means, the secondary mass, in particular the output flange, being mounted radially inward of the fastening opening on the primary mass directly or indirectly via a bearing is, wherein the secondary mass has at least one through opening for the introduction of a tool for fastening the primary mass to an input shaft with the aid of the connecting means. As a result, the secondary mass can be mounted on the primary mass on a comparatively small radius, so that a correspondingly inexpensive mount can be used. The bearing is designed in particular as a deep groove ball bearing. The secondary mass can, in particular, be mounted on the primary mass to prevent it from tipping over. A simple assembly of the clutch assembly can be ensured through the through opening if the primary mass is to be connected to the input shaft, in particular a crankshaft of a motor vehicle engine.

The primary mass particularly preferably has at least one fastening opening for fastening the primary mass to an input shaft with the aid of a connecting means, the secondary mass, in particular the output flange, being mounted radially outside the fastening opening on the primary mass directly or indirectly via a bearing. By mounting the secondary mass radially outside of the fastening opening, a through opening in the secondary mass that is aligned with the fastening opening can be saved. The bearing is designed in particular as a deep groove ball bearing. The secondary mass can, in particular, be mounted on the primary mass to prevent it from tipping over.

In particular, the bearing is designed as a plain bearing or roller bearing, in particular a deep groove ball bearing. Tilting of the secondary mass out of a radial plane of the clutch assembly can be avoided. The bearing is preferably designed to absorb both radial forces and axial forces. The bearing can thereby also specify an axial relative position of the secondary mass to the primary mass.

The friction clutch is preferably arranged radially inside to the energy storage element, with the friction clutch in particular being arranged at least partially in a common axial area with the energy storage element. Viewed in the axial direction, the energy storage element and the friction clutch can at least partially overlap. The friction clutch can thereby be positioned at least partially nested in the dual mass flywheel. The axial installation space can thus be kept small.

Particularly preferably, the primary mass has at least one fastening opening for fastening the primary mass to an input shaft with the aid of a connecting means, with a sealing element in the form of a plain bearing or axial ring, in particular designed as a plain bearing or axial ring, for sealing one of the fastening opening radially outside of the fastening opening the primary mass and / or the secondary mass limited receiving space is provided for receiving the energy storage element. The receiving space can thereby be well sealed, in particular together with the sealing membrane. This can prevent lubricant from leaking radially inward from the recess. This can prevent lubricant from reaching the friction pairings of the friction clutch and influencing the friction properties of the friction clutch.

• 1: eine schematische Schnittansicht einer ersten Ausführungsform eines Kupplungsaggregats und
• 2: eine schematische Schnittansicht einer zweiten Ausführungsform eines Kupplungsaggregats.

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

• 1 : a schematic sectional view of a first embodiment of a clutch assembly and
• 2 : a schematic sectional view of a second embodiment of a clutch unit.

This in 1 shown clutch unit 10 is for example for coupling a motor shaft of a motor vehicle engine with torsional vibration damped coupling with an intermediate shaft leading to a rotor of an electrical machine 12 intended. The clutch unit has a dual-mass flywheel for damping torsional vibrations 14th on, the one attachable to the motor shaft primary mass 16 having. The primary mass 16 delimits an annular receiving space 18th , in which an energy storage element designed as a bow spring 20th is recorded. The primary mass 16 can for example via inwardly protruding impressions at one end of the energy storage element 20th stop tangentially. An output flange can be provided at the other end of the energy storage element 22nd one to the primary mass 16 limited rotatable secondary mass 24 stop tangentially.

The output flange 22nd forms in one of the intermediate shaft 12 offset radius area a friction surface 26th for a friction clutch 28 out. The output flange 22nd can thereby simultaneously act as a counterplate for the friction clutch 28 form, to the with the help of an axially displaceable pressure plate 30th one via an output hub 32 Clutch disc non-rotatably attached to the intermediate shaft 34 can be frictionally pressed. For axial displacement of the pressure plate 30th is designed in the manner of a disc spring Lever spring 34 provided on one with the output flange 22nd riveted clutch cover 36 is supported pivotably about a pivot point extending in the circumferential direction by changing its conicity. Together with the intermediate flange 22nd and the clutch cover 36 is a sealing membrane 38 riveted over a slip ring 40 on a welded-on lid 42 the primary mass 16 with a spring preload.

The primary mass 16 has a mounting opening 44 on, in which a connector designed as a screw 46 Can be plugged in to the primary ground 16 to attach to the motor shaft of the motor vehicle engine. To do this, a tool on the connecting means 46 to be able to start, shows the output hub 32 and possibly also the lever spring 34 Mounting holes 48 on.

In the in 1 The illustrated embodiment is the secondary mass 24 radially inward of the mounting opening 44 at the primary mass 16 about a warehouse 50 stored and centered. The warehouse 50 is designed for example as a deep groove ball bearing, the bearing 50 alternatively, it can also be designed as a slide bearing, in particular as a radial and axial slide bearing. The bearing can tilt the secondary mass 24 and in particular tilting of the friction surface 26th from a radial plane of the clutch unit 10 prevent and support both radial forces and axial forces. About the accessibility of the lanyard 46 for the tool to get, the secondary mass can 24 one coaxial with the mounting opening 44 aligned passage opening 52 exhibit. If necessary, the recording room is 18th radially outward to the mounting opening 44 via one at primary ground 16 and the secondary mass 24 axially adjacent axial ring, not shown, sealed radially inward.

At the in 2 illustrated embodiment of the clutch unit 10 is compared to the in 1 shown clutch unit 10 the secondary mass 24 radially outward to the mounting opening 44 at the primary mass 16 stored. The warehouse 50 is designed for example as a radial and axial sliding bearing, the bearing 50 alternatively, it can also be designed as a roller bearing, in particular as a deep groove ball bearing. To support the radial forces of the bearing 50 is with the help of the lanyard 46 a centering piece 54 with the primary mass 16 connected. The warehouse 50 can in particular also perform a sealing function, so that the receiving space 18th through the camp 50 is sealed radially inward.

List of reference symbols

10

Centering piece

12

Intermediate shaft

14th

Dual mass flywheel

16

Primary mass

18th

Recording room

20th

Energy storage element

22nd

Outlet flange

24

Secondary mass

26th

Friction surface

28

Friction clutch

30th

Pressure plate

32

Output hub

34

Lever spring

36

Clutch cover

38

Sealing membrane

40

Slip ring

42

cover

44

Mounting hole

46

Lanyard

48

Assembly opening

50

camp

52

Through opening

54

Centering piece

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 for coupling a motor shaft of an internal combustion engine with a rotor of an electrical machine, with a dual-mass flywheel (14) for damping torsional vibrations, the dual-mass flywheel (14) having a primary mass (16) that can be directly or indirectly connected to the motor shaft and a secondary mass (24) that can be rotated to a limited extent via an energy storage element (20) designed in particular as an arc spring, wherein the secondary mass (24) has an output flange (22) which can be attached tangentially to the energy storage element (20), and a friction clutch (28) designed in particular as a plate clutch for coupling the secondary mass (24) to the rotor of the electrical machine, wherein the output flange (22) forms a friction surface (26) for frictional contact with an axially displaceable clutch disc (34) of the friction clutch (28) that can be coupled to the rotor. Clutch unit according to Claim 1 characterized in that the friction surface (26) is provided in a radius region of the output flange (22) that is bent away from the rotor. Clutch unit according to Claim 1 or 2 characterized in that with the output flange (22) a clutch cover (36) for the axial, in particular pivotable, support of an actuating element, in particular designed as a lever spring (34) pivotable about a pivot axis running in the circumferential direction, for the displacement of a pressure plate (30) for axial pressing the clutch disc (34) is connected between the pressure plate (30) and the output flange (22). Clutch unit according to one of the Claims 1 to 3 characterized in that the primary mass (16) and / or the secondary mass (24) delimit an annular receiving space (18) for receiving the energy storage element (20), with a relatively rotatable sealing membrane (38) which can be slid off the primary mass (16) for sealing of the receiving space (18) opposite the friction clutch (28) is connected to the output flange (22), in particular the sealing membrane (38) and the clutch cover (36) being fastened to the output flange (22) via a common fastening means. Clutch unit according to one of the Claims 1 to 4th characterized in that the clutch disc (34) has an output hub (32) for rotationally fixed but axially displaceable coupling to the rotor of the electrical machine, the output hub (32) having at least one assembly opening (48) for the introduction of a tool for fastening the primary mass (16) ) having an input shaft with the aid of a connecting means (46). Clutch unit according to one of the Claims 1 to 5 characterized in that the primary mass (16) has at least one fastening opening (44) for fastening the primary mass (16) to an input shaft with the aid of a connecting means (46), the secondary mass (24), in particular the output flange (22), radially inside to the fastening opening (44) on the primary mass (16) is mounted directly or indirectly via a bearing (50), the secondary mass (24) having at least one through opening (52) for introducing a tool for fastening the primary mass (16) to an input shaft with the aid of the connecting means (46). Clutch unit according to one of the Claims 1 to 5 characterized in that the primary mass (16) has at least one fastening opening (44) for fastening the primary mass (16) to an input shaft with the aid of a connecting means (46), the secondary mass (24), in particular the output flange (22), radially outside is mounted directly or indirectly via a bearing (50) to the fastening opening (44) on the primary mass (16). Clutch unit according to Claim 6 or 7th characterized in that the bearing (50) is designed as a slide bearing or roller bearing, in particular a deep groove ball bearing. Clutch unit according to one of the Claims 1 to 8th characterized in that the friction clutch (28) is arranged radially inside to the energy storage element (20), in particular the friction clutch (28) being arranged at least partially in a common axial area with the energy storage element (20). Clutch unit according to one of the Claims 1 to 9 characterized in that the primary mass (16) has at least one fastening opening (44) for fastening the primary mass (16) to an input shaft with the aid of a connecting means (46), with a connection on the primary mass (16) radially outside of the fastening opening (44) and the outlet flange (22) sealing element, in particular designed as a slide bearing or axial ring, is provided for sealing a receiving space (18) delimited by the primary mass (16) and / or the secondary mass (24) for receiving the energy storage element (20).

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