DE102014116627B3 - Coupling arrangement and operating method - Google Patents

Abstract

The invention relates to a clutch arrangement (1) comprising a fluid friction clutch (6) and a friction disc clutch (5) for transmitting a drive torque from a drive motor side primary side (2) to a secondary side secondary side (4), in particular in a motor vehicle, wherein the fluid friction clutch (6). a control valve (12) having a control mechanism as well as a shear fluid reservoir (13) with a shear gap (14) connecting control valve (19) for varying a Scherfluidstandes in the shear gap (14) for setting a slip and wherein the friction disc clutch (5) a by means of an electromagnetic actuator (8) relative to a friction partner (17) adjustable friction disc (10), and wherein the fluid friction clutch (6) by closing the friction disc clutch (5) can be bridged. According to the invention it is provided that the friction disc (10) is part of the actuating mechanism and the control valve (12) by adjusting the friction disc (10) relative to the friction partner (17) is actuated.

Description

The invention relates to a coupling arrangement according to the preamble of claim 1, comprising a fluid friction clutch and a friction disc clutch for transmitting a drive torque from a drive motor side primary side on a Nebenaggregatseitige secondary side, in particular in a motor vehicle, the fluid friction clutch an actuating mechanism and a, a shear fluid reservoir fluid-conducting with a A shear gap connecting, control valve opening having control valve for varying a Scherfluidstandes in the shear gap (the fluid friction clutch) for adjusting a slip (the fluid friction clutch) and wherein the friction disc clutch by means of an electromagnetic actuator relative to a friction partner adjustable friction disc, and wherein the fluid friction clutch by closing the Friction disc clutch can be bridged.

Furthermore, the invention relates to a method for operating a clutch assembly according to the preamble of claim 12, comprising a fluid friction clutch and a friction disc clutch for transmitting a drive torque from a drive motor side primary side to a Nebenaggregatseitige secondary side of the clutch assembly, wherein the fluid friction clutch is an actuating mechanism and a, a shear fluid reservoir Fluid control with a shear gap connecting, control valve opening exhibiting control valve for varying a Scherfluidstandes in the shear gap for adjusting a slip and wherein the friction disc clutch has a friction disc which is displaced relative to a friction partner (in particular rotor) by means of an electromagnetically generated adjusting force and wherein the fluid coupling Closing the friction disc clutch is bridged.

Furthermore, the invention relates to a drive train according to claim 15.

For driving ancillaries, such as fan wheels in motor vehicles in practice often single or multi-stage friction disc clutches are used. Such, for example, designed as electromagnetically actuated clutches friction disc clutches are for example in the EP 0 317 703 A2 , of the DE 32 03 143 C2 or the DE 42 07 710 A1 described. Friction disc clutches have no slip when connected and thus no differential number on the bearing. Particularly in the case of single-stage friction disk clutches, it is disadvantageous that these often make undesirably high output speeds available in the engaged state at high drive speeds and, in addition, strong shift shocks occur.

Instead of friction disk clutches, it is known to use so-called fluid friction clutches, also called viscous couplings or viscous couplings, for transmitting torques to ancillary components in motor vehicles. In viscous couplings, a speed is transmitted from a primary side to a shearing fluid and from there to a secondary side of the clutch. With regard to a possible structure of fluid friction clutches is on the US Pat. No. 4,305,491 , the EP 1 248 007 B1 or the DE 699 11 479 T2 directed.

Most commercially available fluid friction clutches include a hydraulic control valve that can adjust the slip of the fluid friction clutch. In simple embodiments, the opening cross section of the control valve is adjusted via a temperature-detecting bimetallic element.

In addition, designed as a solenoid valve control valves are known which control the flow of fluid between a shearing fluid reservoir and the shear gap and thus the slip between the primary and secondary sides of the friction disc clutch. In principle, it is known to design the hydraulic control valves as proportional valves or, alternatively, as clocked discrete valves, in which the flow rate is dependent on the ratio of the open time component in the closed time component of the valve element. In contrast to the single-stage friction disc clutches, fluid friction clutches have a sluggish response and are subject to high slip values.

The applicant has described for transmitting torques between a drive motor and an accessory clutch assemblies, which consist of a combination of a friction disc clutch with a fluid friction clutch, wherein the fluid friction clutch for realizing a 1: 1 switching by means of the friction disc clutch can be bridged. Such, for example in the WO 2012/156264 A1 or the WO 2013/135457 A1 Coupling arrangements described above unite especially the advantages of both types of coupling, while largely avoiding or minimizing their disadvantages.

From the WO 2012/156264 A1 It is known to the Applicant that advantageously a common electromagnetic actuator is provided for actuating the control valve of the fluid friction clutch and the friction disc of the friction disc clutch. An appropriate one Actuating mechanism alternatively includes an expensive to be stored relative to the drive shaft rotary armature, a hinged armature or alternatively a translationally adjustable armature, which are each arranged spaced from a friction disc of the friction disc clutch of the clutch assembly.

The known clutch arrangement has proved successful, but there are efforts to simplify the actuating mechanism for actuating the control valve of the fluid friction clutch for adjusting the fluid flow between a reservoir and a shear gap and thus the Reibscheibenkupplungsschlupfes.

As a further prior art, the DE 10 2013 102 716 A1 called. This document also shows a clutch assembly, comprising a friction disc clutch and a fluid friction clutch, which can be bridged by the friction disc clutch depending on certain operating conditions.

The DE 102 32 138 A1 shows a clutch assembly for driving a coolant pump. Parallel to a clutch, a fluid friction clutch is switchable in the drive train.

Based on the aforementioned prior art, the invention is therefore based on the object, a clutch assembly comprising a friction disc clutch and a bridged by this for a 1: 1 switching fluid friction clutch with a simplified, preferably space-optimized actuating mechanism for actuating the control valve of the fluid friction clutch of the clutch assembly and to provide a method of operating such a coupling arrangement.

This object is achieved with respect to the coupling arrangement with the features of claim 1, d. H. in a generic clutch arrangement, characterized in that the friction disc is part of the actuating mechanism for the control valve and the control valve is actuated by adjusting the friction disc relative to the friction partner or the components of the primary side of the clutch assembly. In other words, the adjustment of the friction disc in the clutch assembly according to the invention is responsible for a change in the free cross section of the control valve for adjusting the shear fluid flow between a shear fluid reservoir and a shear gap of the fluid friction clutch. In other words, the friction disc actuates the control valve.

With regard to the operating method, the object is achieved with the features of claim 12, d. H. in a generic method, characterized in that the friction disc is part of the actuating mechanism and the control valve of the fluid friction clutch is actuated by adjusting the friction disc relative to the friction partner.

Advantageous developments of the invention are specified in the subclaims. All combinations of at least two features disclosed in the description, the claims and / or the figures fall within the scope of the invention.

In order to avoid repetition, features disclosed in accordance with the device should also be regarded as disclosed according to the method and be able to be claimed. Likewise, according to the method disclosed features should be considered as device disclosed and claimed claimable.

The invention is based on the idea to simplify the complex in the prior art actuating mechanism for changing the free cross-sectional opening of the control valve opening for influencing the flow between a Scherfluidreservoir and a shear gap of the fluid friction clutch of the clutch assembly in that a friction disc of the friction disc clutch is part of this actuating mechanism, such in that a, preferably axial, adjustment of the friction disc relative to its friction partner causes a change in the free cross section of a connecting opening (control valve opening) of the shearing fluid reservoir to the shear gap and in this way the slip of the fluid friction clutch of the clutch arrangement can be varied. In other words, a control valve movement for adjusting a shearing fluid flow between a shearing fluid space and a shearing gap is integrated into an already necessary lifting movement of the friction disk of the friction disk clutch, which is preferably designed as an armature disk. As a result, the actuating mechanism is simplified as a whole and it is space and weight saved compared to previous solutions. At the same time, the number of necessary components of the actuating mechanism is reduced, in particular to a minimum. The solution according to the invention enables a proportional influence of the shear fluid flow in the fluid friction clutch to a current applied to the electromagnetic actuator for adjusting the friction disc of the friction disc clutch which forms part of the actuating mechanism for the control valve. In this case, the clutch arrangement is preferably designed such that the Leerhubbereich the friction disc, or as will be explained later at least one Reibscheibenabschnittes, ie the adjustment used before reaching or conditioning the friction disc (armature disc) on the friction partner for actuation of the hydraulic control valve becomes. In the coupling arrangement according to the invention can thus be used in a particularly simple and space-saving and weight-saving manner, a common electromagnetic actuator for adjusting the friction disc of the friction disc clutch and actuation of the hydraulic control valve of the fluid friction clutch.

In the manner described above, the invention succeeds in a clutch assembly in which preferably a fluid friction clutch and a friction disc clutch, with which the fluid friction clutch for a 1: 1 switching torque from a drive shaft to the auxiliary unit can be bridged, further expand and the number of necessary Electromagnetic actuators to a minimum, preferably to restrict a single electromagnetic actuator, while implementing a simple and space-saving and weight-saving construction. Preferably, the fluid friction clutch and the friction disc clutch are arranged in a common housing. It is further preferred if the friction disk of the friction disk clutch flows around the shearing fluid from the shearing fluid reservoir, wherein the shearing fluid is preferably also located between the friction disk and the friction partner.

The at least one shear gap of the fluid friction clutch to be supplied with shearing fluid from the shearing fluid reservoir via the control valve opening is preferably a shear gap with a constant, d. H. non-variable gap width. Additionally or alternatively, a shear gap can be supplied or provided, the Spaltbereite is adjustable, in particular in which this shear gap is limited by the adjustable friction disc of the friction disc clutch of the clutch assembly.

In a further development of the invention is advantageously provided that the integration of the friction disc or a Reibscheibenabschnitts, which cooperates frictionally engaged in a connection of Reibscheibenkupplung with a friction partner for torque transmission in that a relative to, preferably axially spaced from the friction disc Control valve opening for adjusting their free flow cross-section adjustable valve element of the actuating mechanism on the friction disc indirectly, d. H. via at least one further component or adjustable element or directly fixed or formed by a corresponding geometric design of the friction disc or a Reibscheibenabschnitts of this or this, so that a lifting movement (axial adjustment movement) of the friction disc directly a control valve actuation, d. H. causes an adjusting movement of the aforementioned valve element relative to the control valve opening. In the case of direct or indirect fixing of the valve element to the friction disc or the friction disc section, this can be determined, for example, by screwing, riveting or welding. The friction disc or the friction disc portion is rotatably connected to a control valve opening having the component, in particular a shearing fluid reservoir bounding reservoir wall, such that the friction disc can perform a lifting movement relative to the control valve opening, however, no rotational movement relative thereto. Depending on the configuration of the clutch arrangement, friction disk and control valve opening can alternatively be arranged on the primary side or on the secondary side.

To implement a substantially axial lifting or adjusting movement of the friction disc in a control valve operation, in particular a relative displacement of a valve member for control valve opening, it has been found to be advantageous if the control valve opening is provided in a reservoir wall portion of the shear fluid reservoir, which is either parallel to a rotational axis of Coupling arrangement, in particular a rotation axis of a drive shaft extends or at a comparatively small angle between 1 ° and 30 ° to this axis of rotation, which preferably results from an opening longitudinal axis or depth of the control valve opening perpendicular to the aforementioned axis of rotation or at an angle between 1 ° and 30 ° to this runs. As a result of the aforementioned arrangement, the movement of a valve element also extends at least approximately axially relative to the control valve opening.

However, other solutions can also be implemented, for example with a reservoir wall extending at least approximately in the radial direction and supporting the control valve opening.

Of particular advantage is an embodiment of the clutch assembly in which a multi-part friction disc comprising a first and at least a second friction disc section is used, wherein the first and / or the second friction disc is preferably formed as an annular disc / is. It is particularly useful in this case, the Reibscheibenabschnitte, preferably coaxially with each other, ie adjacent to arrange in the radial direction. When the friction disc clutch is in the closed state, the first and the second friction disc sections cooperate with a common friction partner or with separate friction partners, in each case transferring torque from one side of the clutch arrangement to the other side of the clutch arrangement by frictional engagement with each other a friction partner, to bridge the fluid friction clutch, ie to set slip.

One of the friction disc sections is part of the actuating mechanism for the control valve, d. H. a lifting movement of this friction disk section, preferably a radially inner friction disk section, effects a change in the free flow cross section of a control valve opening, in particular in that a valve element, in particular a valve slide, is directly or indirectly fixed to this friction disk section or is formed by the friction disk section. In such an embodiment of the clutch assembly must therefore be adjusted for adjusting the slip only one of a plurality Reibscheibenabschnitten relative to at least one other friction disc, whereby the moving mass is lower than in a alternativealisierbaren embodiment in which the entire friction disc for actuating the control valve relative to the friction partner must be adjusted. As a result, the adjusting forces are lower in the further development of the invention. If necessary, separate electromagnetic actuators may be associated with the actuation or adjustment of the first friction disc section and the second friction disc section, wherein the electromagnetic actuator simultaneously serves to actuate the control valve associated with the actuator part for the control valve forming friction disc section. However, an arrangement in which the first and the second Reibscheibenabschnitt, preferably all, more preferably only two Reibscheibenabschnitten the clutch assembly is assigned a common, in particular a single, electromagnetic actuator with which both the Reibscheibenabschnitte adjustable and the control valve is actuated ,

With regard to the dimensioning of the two friction disk sections, there are different possibilities. Preferably, the separation between a first and a second Reibscheibenabschnitt follows in the region of an average diameter with respect to a rotational axis of the clutch assembly, even more preferably in the region of a magnetic separation.

To be particularly advantageous, it has been found that for adjusting the first and the second Reibscheibenabschnittes different sized spring forces must be overcome, and it is particularly useful if the spring force to be overcome in the one part of the actuating mechanism for the control valve forming friction disc is less than that Spring force of the other friction disc section, which has essentially only the task of a 1: 1 switching. The realization or provision of different spring forces can be realized by two separate springs or two different spring portions of a common spring, in particular by choosing appropriate spring stiffnesses. As mentioned, the spring stiffness or spring forces are preferably coordinated such that first, d. H. even at lower effective electrical voltages, a radially inner friction disc section (armature disc section) attracts and a radially outer friction disc section (armature disc section) at a larger effective second electrical voltage. In this case, the radially inner friction disc portion is part of the aforementioned actuating mechanism of the control valve, which in principle also a reverse arrangement can be realized, d. H. wherein a radially outer friction disc portion is part of the actuating mechanism for the control valve and against a smaller spring force by means of an electromagnetic actuator is adjustable than the then inner second friction disc section.

In the case of the realization of two separate return springs, it is preferred to connect one of these springs directly rotatably connected to a drive shaft and the other, preferably radially outer, spring on a shear gap at the same time forming or supporting disc, preferably a primary pulley, which in turn rotatably with the drive shaft is connected.

Particularly advantageous is a cascading of the multipart, d. H. several exposed at least partially independently adjustable friction disc sections having friction disc. The cascading is achieved via an axial stop of one part of the operating mechanism for the control valve forming Reibscheibenabschnittes on the other Reibscheibenabschnittes, in particular a radially inner Reibscheibenabschnittes on a radially outer Reibscheibenabschnitt so that the Reibscheibenabschnitt for actuating the control valve to hit the axial stop of the other Reibscheibenabschnittes independently of this is adjustable and that then both Reibscheibenabschnittes are adjusted together on the friction partner in particular when applying a correspondingly large effective electrical voltage. To realize this Axialanschlags overlap the Reibscheibenabschnitte in the radial direction.

In this case, the cascading according to further developments ensures that with an effective tension from a first area of tension, the friction disk section, which preferably has a smaller friction surface, forms part of the Actuating mechanism for the control valve is actuated and this does not apply directly to the friction partner (rotor), but at the, in particular a larger friction surface having, preferably radially outer, further friction disc section which moves with the same rotational relative speed to the friction partner or rotated. This avoids that in the context of the adjustment of only one part of the actuating mechanism forming Reibscheibenabschnittes at Reibpartner due to lack of investment in this no friction loss. Only the control valve is actuated. If full engagement of the friction disc clutch is achieved with the aid of a second, preferably larger effective, electrical voltage, then both friction disc sections engage with the friction partner (rotor) and together contribute to torque transmission in 1: 1 connection and bridging of the fluid friction clutch.

The aforementioned preferred mode of operation relates to a normally open friction disc clutch. If required, this can also be realized normally closed, in which case the effective voltages or voltage levels for actuating the control valve or for realizing a 1: 1 connection must be adjusted accordingly.

In the foregoing, the terminology of effective electrical voltage means average or effectively applied voltage. If the electromagnet arrangement is energized, for example, with constant direct currents, an effective voltage and, consequently, an effective current intensity are to be understood in each case as meaning the constant voltage (non-pulsed voltage). If the electromagnet arrangement is supplied, for example, with a PWM signal, then the effective voltage is to be understood as the resulting or, in a specific time interval, in particular a period, average electrical voltage.

In order to ensure a multi-part friction disc sufficient movement play for a proportional actuation of the control valve, it is preferred if the one part of the actuating mechanism of the control valve forming the Reibscheibenabschnitte with de-energized electromagnetic actuator further from the, preferably common friction partner for both Reibscheibenabschnitte spaced as the other, preferably radially further outer friction disc section.

The invention also leads to a drive train, in particular in a motor vehicle, having a primary-side drive motor, in particular an internal combustion engine and a secondary-side accessory, in particular a fan wheel, wherein the drive train for transmitting a torque from the drive motor, in particular from a drive shaft driven by the drive motor, on the accessory of a trained according to the concept of the invention clutch assembly, which is as mentioned above, preferably a common housing having a clutch, at least to a clutch assembly comprising both a fluid friction clutch and a friction disc clutch, with the latter a 1: 1 switching from the drive shaft to the auxiliary unit should be feasible.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.

These show in:

1 a first designed according to the concept of the invention embodiment of a clutch comprising a fluid friction clutch and a friction clutch clutch assembly with a one-piece friction disc, by the adjustment of a control valve for adjusting the slip of a fluid friction clutch is adjustable

2 an alternative variant of such a clutch arrangement designed according to the concept of the invention, wherein here the friction disk is formed by two individually sprung friction disk sections and an inner one of the friction disk sections is part of the control valve actuating device,

3 a possible embodiment of the friction disc sections according to 2 for the realization of a cascaded coupling, and

4a to 4c : different lifting or adjustment states of the multi-part friction disc according to 3 ,

In the figures, like elements and elements having the same function are denoted by the same reference numerals.

In 1 is a detail of a drive train with a clutch assembly 1 shown. A primary page 2 the clutch assembly 1 is rotatably connected to a drive shaft 3 , which is driven by a drive motor, not shown, in particular an internal combustion engine, even more preferably in a motor vehicle. To transfer the torque from the drive shaft 3 or the primary side 2 on a secondary side 4 and thus to a not shown, with the secondary side 4 operatively connected accessory, for example a Fan, has the clutch assembly 1 both a friction disc clutch 5 as well as a fluid friction clutch 6 (Viscous coupling), wherein the fluid friction clutch with the friction disc clutch 5 for a 1: 1: switching of the torque from the primary side 2 on the secondary side 4 can be bridged. Specifically, here are the friction disc clutch 5 and the fluid friction clutch 6 realized as a common coupling.

The clutch assembly comprises a control unit 7 with which an electromagnetic actuator 8th More precisely, a coil arrangement 9 of the actuator 8th controllable, ie with different effective voltages and thus electrical currents can be acted upon. The coil arrangement 9 may alternatively be applied with different constant currents or pulsed currents, ie with a PWM signal. By means of the electromagnetic actuator 8th can both a friction disc 10 (Anchor) axially, ie substantially parallel to a rotation axis 11 the clutch assembly 1 adjusted and a control valve 12 the fluid friction clutch 6 for adjusting the shear fluid flow between a shear fluid reservoir 13 and a shear gap formed here by way of example as a labyrinth gap 14 the fluid friction clutch 6 between primary page 2 and secondary side 4 and thus the slip between primary side 2 and secondary side 4 be set.

In the embodiment shown, the primary side comprises 2 one together with the drive shaft 3 rotatable, ie non-rotatable with the drive shaft 3 connected primary disk 15 , which in the drawing plane left the shear gap 14 limited and moreover carrier is for the friction disc 10 which has a return spring 16 at the primary disk 15 is fixed.

The coupling arrangement shown 1 is realized as a normally open clutch, which means that the friction disc clutch 5 only by a corresponding energization of the coil assembly 9 of the electromagnetic actuator 8th can be closed, reducing the friction disc 10 axially against a secondary side friction partner 17 (Rotor) adjusted and thus the fluid friction clutch 6 is bridged, so a torque 1: 1 from the drive shaft 3 on the secondary side 4 is transmitted.

In 1 it can be seen that on the one-piece friction disc 10 , Here in a radially inner region a valve element 18 , For example, is fixed by screwing, which by axially adjusting the friction disc 10 relative to a control valve opening 19 is adjusted, whereby their free cross-sectional area in dependence of the adjustment path of the friction disc 10 is changed, wherein the adjustment of the friction disc 10 again depends on the amount of current to the coil assembly 9 , This results in a proportional hydraulic control valve 7 ,

In the 1 shown coupling arrangement 1 differs in part from the coupling arrangement 1 according to 1 , In order to avoid repetition, the following is essentially based on the differences from the exemplary embodiment 1 received. With regard to the similarities will be on 1 with the preceding figure description referenced.

In contrast to the embodiment according to 1 is the friction disk 10 in the embodiment according to 2 designed in two parts and includes a radially inner friction disc section 10a and a radially outer second friction disc section disposed coaxially therewith 10b , wherein only the radially inner, first friction disc section 10a Part of the actuating mechanism for actuating the control valve 12 is. To realize this carries the radially inner, and a smaller friction surface than the second Reibscheibenabschnitt 10b having, first friction disc section 10a designed as a valve spool valve element 18 which is at an adjusting movement of the first friction disc section 10a relative to the control valve opening 19 is adjusted to the variation of its free cross section.

It can be seen that the first friction disk section 10a against a first (return) spring force of a first return spring 20 is adjustably arranged, with which the first friction disc section 10a spaced from the primary pulley 15 on the drive shaft 3 is set while the second friction disc section 10b analogous to the embodiment according to 1 over here as a second return spring 21 designated spring on the primary pulley 15 is fixed.

Will the coil assembly 9 of the electromagnetic actuator 8th in the embodiment shown for adjusting both Reibscheibenabschnitte 10a . 10b is provided, energized with a first effective electrical voltage from a first (lower) electric voltage range, moves only the first friction disc section 10a relative to the friction partner 17 (Rotor), which is a common friction partner for both friction disc sections 10a . 10b is. In this relative movement, the first friction disc section adjusted 10a at the same time relative to the then still stationary second friction disc section 10b , which is primarily due to that of the first return spring 20 provided first spring force (return spring force) is less than one of the second return spring 21 provided return spring force. If an effective voltage threshold is exceeded and the coil arrangement 9 via the control unit 7 applied to a second effective electrical voltage, which is higher than a voltage from the aforementioned first voltage range, and the second friction disc moves 10b axially in the direction of the friction partner 17 to.

The magnetic flux 22 when energizing the coil assembly 9 is shown by dashed lines.

It can be seen that this is always through both friction disc sections 10a . 10b runs and between these and the friction partner 17 axially back and forth "jumps", ie. flooded several times, due to corresponding magnetic separations 23 , Basically it is possible, as in 2 shown, the Reibscheibenabschnitte 10AV . 10b mechanically not to be coupled. However, it is preferred to realize a cascading, as exemplified in 3 is shown.

Here is a partial view of the first Reibscheibenabschnitt 10a and radially adjacent thereto, the second friction disc portion 10b shown. It can be seen that the Reibscheibenabschnitte 10a . 10b overlap in the radial direction, that is, the second friction disc section 10b an axial stop 24 for the first friction disc section 10a has, to the adjustment of the Reibscheibenabschnittes 10a relative to the second friction disc section 10b at a current supply of the coil assembly 9 to limit with a first voltage from a first voltage range. As a result, a further movement in the direction of friction partner 17 avoided as long as there is not a threshold exceeding second effective voltage applied, in which also the second friction disc section 10b towards the friction partner 17 moved, then together with the friction disc section 10a so that these together to attach to the friction partner 17 can come.

For clarity, is in 3 as well as in the following 4a to 4c not shown the valve element for opening and closing the control valve opening of the control valve. The valve element is on the first friction disc section 10a established.

In 4a is an operating state of only partially shown coupling arrangement 1 shown, in which the electrical coil arrangement, not shown 9 of the electromagnetic actuator 8th is subjected to a comparatively low voltage. Consequently, the first friction disc portion 10a not or comparatively low in the direction of friction partners 17 , so that a comparatively large distance between the radially overlapping Reibscheibenabschnitten 10a . 10b given is.

In the in 4b shown operating state is the energization of the coil assembly 9 chosen so that the first friction disc section 10a for contact with the axial stop 24 the second friction disc section 10b comes, which itself has not or possibly only slightly adjusted axially.

When a threshold voltage which is greater than a voltage from a first voltage range is exceeded, the second friction disk portion 10b , as in 4c is shown as well as the first friction disc section 10a to close the friction disc clutch and by 1: 1 torque switching to the friction partner 17 emotional.

LIST OF REFERENCE NUMBERS

1

clutch assembly

2

primary

3

drive shaft

4

secondary side

5

friction disc clutch

6

Fluid friction clutch

7

control unit

8th

electromagnetic actuator

9

coil assembly

10

friction

10a

first friction disc section

10b

second friction section

11

axis of rotation

12

control valve

13

Shear fluid reservoir

14

shear gap

15

primary disc

16

Return spring

17

Friction partner (rotor)

18

valve element

19

Control valve opening

20

first return spring

21

second return spring

22

magnetic river

23

magnetic separation

24

axial stop

Claims (15)

Coupling arrangement ( 1 ) comprising a fluid friction clutch ( 6 ) and a friction disc clutch ( 5 ) for transmitting a drive torque from a drive motor side primary side ( 2 ) on a Nebenaggregatseitige secondary side ( 4 ), in particular in a motor vehicle, wherein the fluid friction clutch ( 6 ) an actuating mechanism and a shear fluid reservoir ( 13 ) fluid-conducting with a shear gap ( 14 ) connecting control valve opening ( 19 ) having control valve ( 12 ) for varying a shear fluid level in the Shearing gap ( 14 ) for adjusting a slip and wherein the friction disc clutch ( 5 ) one by means of an electromagnetic actuator ( 8th ) relative to a friction partner ( 17 ) adjustable friction disc ( 10 ), and wherein the fluid friction clutch ( 6 ) by closing the friction disc clutch ( 5 ) is bridgeable, characterized in that the friction disc ( 10 ) Is part of the actuating mechanism and the control valve ( 12 ) by adjusting the friction disc ( 10 ) relative to the friction partner ( 17 ) is operable. Coupling arrangement according to claim 1, characterized in that a relative to the, preferably axially of the friction disc ( 10 ) spaced, control valve opening ( 19 ) for adjusting the free flow cross-section adjustable valve element ( 18 ) of the actuating mechanism on the friction disc ( 10 ) is indirectly or directly fixed or formed by this, so that an axial adjustment movement of the friction disc ( 10 ) an adjusting movement of the valve element ( 18 ) causes. Coupling arrangement according to one of the preceding claims, characterized in that the control valve opening ( 19 ) in an axial direction parallel to a rotation axis ( 11 ) of the coupling arrangement ( 1 ) or at an angle between 1 ° and 30 ° to the axis of rotation ( 11 ) extending reservoir wall is provided, wherein an opening longitudinal axis perpendicular to the axis of rotation ( 11 ) or at an angle between 1 ° and 30 ° to this extends. Coupling arrangement according to one of the preceding claims, characterized in that the friction disc ( 10 ) a first, preferably designed as an annular disc, Reibscheibenabschnitt ( 10a ) and one, preferably radially adjacent thereto arranged, preferably designed as an annular disc, the second friction disc section ( 10b ), and that the first, preferably radially inner, Reibscheibenabschnitt ( 10a ), which is part of the actuating mechanism for the control valve ( 12 ) is, relative to the second friction disc section ( 10b ) is adjustable. Coupling arrangement according to claim 4, characterized in that the first and the second friction disc section ( 10a . 10b ) with closed friction disc clutch together on the, in particular common, friction partner ( 17 ) abut frictionally. Coupling arrangement according to one of claims 4 or 5, characterized in that the first friction disc section ( 10a ) against a first spring force and the second friction disc section ( 10b ) against a second spring force which is greater than the first spring force by energizing the electromagnetic actuator ( 8th ) are axially adjustable. Coupling arrangement according to one of claims 4 to 6, characterized in that the second friction disc section ( 10b ) an axial stop ( 24 ) for the first friction disc section ( 10a ) for limiting an adjustment movement of the first friction disc section ( 10a ) relative to the second friction disc section ( 10b ) having. Coupling arrangement according to one of claims 4 to 7, characterized in that a friction surface of the first Reibscheibenabschnittes ( 10a ) in the case of a de-energized electromagetic actuator ( 8th ) axially further from the friction partner ( 17 ) is spaced as a friction surface of the second friction disc portion ( 10b ). Coupling arrangement according to one of claims 4 to 8, characterized in that the first friction disc section ( 10a ) and the second friction disc section ( 10b ) by energizing a common electromagnetic actuator ( 8th ) are axially adjustable, or that separate electromagnetic actuators for adjusting the Reibscheibenabschnitte ( 10a . 10b ) are provided. Coupling arrangement according to one of the preceding claims, characterized in that a control unit ( 7 ) is provided with the electromagnetic actuator ( 8th ) for actuating the control valve ( 12 ) with at least one effective electrical voltage from a first voltage range, preferably for setting different control valve opening cross-sections with different effective electrical voltages from the first voltage range and for closing the friction disc clutch ( 5 ) for bridging the fluid friction clutch ( 6 ) is controllable with a preferably higher, effective second electrical voltage lying outside the first voltage range. Coupling arrangement according to Claim 10 as far as referring back to one of Claims 4 to 9, characterized in that, when an electrical voltage is applied from the first voltage range, only the first friction disk section ( 10a ) is axially adjustable and that upon application of the second voltage of the first and the second Reibscheibenabschnitt ( 10a . 10b ) together relative to the friction partner ( 17 ) are adjustable. Method for operating a clutch arrangement ( 1 ), in particular according to one of the preceding claims, comprising a fluid friction clutch ( 6 ) and a friction disc clutch ( 5 ) for transmitting a drive torque from a drive motor side primary side ( 2 ) on a secondary side secondary side ( 4 ), in particular in a motor vehicle, wherein the fluid friction clutch ( 6 ) an actuating mechanism and a shear fluid reservoir ( 13 ) fluid-conducting with a shear gap ( 14 ) connecting control valve opening ( 19 ) having control valve ( 12 ) for varying a shear fluid level in the shear gap ( 14 ) for adjusting a slip and wherein the friction disc clutch ( 5 ) a friction disc ( 10 ), which relative to a friction partner ( 17 ) is adjusted by means of an electromagnetically generated adjusting force and wherein the fluid friction clutch ( 6 ) by closing the friction disc clutch ( 5 ) is bridged, characterized in that the friction disc ( 10 ) Is part of the actuating mechanism and the control valve ( 12 ) by adjusting the friction disc ( 10 ) relative to the friction partner ( 17 ) is pressed. A method according to claim 12, characterized in that the friction disc ( 10 ) a first, preferably designed as an annular disc, Reibscheibenabschnitt ( 10a ) and one, preferably radially adjacent thereto arranged, preferably designed as an annular disc, the second friction disc section ( 10b ), and that the first, preferably radially inner, Reibscheibenabschnitt ( 10a ), which is part of the actuating mechanism for the control valve ( 12 ) is, for actuating the control valve ( 12 ) relative to the second friction disc section ( 10b ) is adjusted. A method according to claim 13, characterized in that an effective electrical voltage from a first voltage range to a common electromagnetic actuator ( 8th ) and thereby only the first friction disc section ( 10a ) and thereby the free flow cross-section of the control valve opening of the control valve ( 12 ) is varied and that a, preferably higher, second electrical voltage to the actuator ( 8th ) and thereby the first and the second friction disc section ( 10a . 10b ) for closing the friction disc clutch ( 5 ) together against the, preferably common, friction partner ( 17 ) are adjusted. Drive train with a primary-side drive motor, in particular an internal combustion engine, and a secondary-side auxiliary unit, in particular a fan, wherein the drive train for transmitting a torque from the drive motor, preferably a drive shaft driven by the drive motor, on the accessory a clutch assembly ( 1 ) according to one of claims 1 to 11.

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