DE102019204351A1 - Pressurized fluid actuator assembly for a friction clutch - Google Patents

Abstract

A pressure fluid actuation arrangement for a friction clutch comprises a first actuation element (16) and a second actuation element (22) which delimits an actuation pressure fluid chamber (26) with the first actuation element (16), wherein by introducing pressure fluid into the actuation pressure fluid chamber (26 ) the second actuating element (26) can be moved from a basic position with respect to the first actuating element in an actuating direction (B) along a movement axis (A), and by means of a pressurized fluid support arrangement (34) with a variable pressurized fluid support volume with the second actuating element (22 ) rotary decoupling bearing (28) coupled or couplable for common movement.

Description

The present invention relates to a pressurized fluid actuation arrangement such as is used, for example, in commercial vehicles in order to actuate a friction clutch.

Such pressurized fluid actuation arrangements generally comprise a cylinder which is fixedly positioned with respect to the vehicle and a piston which delimits an actuation pressurized fluid chamber with the cylinder and is displaceable in the direction of a movement axis. The piston can act on an energy store, for example the spring tongues of a diaphragm spring, via a rotary decoupling bearing, in order to carry out clutch actuation processes in this way. With wear occurring in a friction clutch, for example the friction linings of a clutch disc, the installation position of such a diaphragm spring, which acts as an energy storage device, changes when the friction clutch is engaged, since with increasing wear, the diaphragm spring relaxes more and more when moving into the engaged state compared to a non-wear state can.

The object of the present invention is to provide a pressurized fluid actuation arrangement for a friction clutch which allows an adaptation to a wear-related change in the installation position of an energy accumulator of a friction clutch in a simple and reliable manner.

• - ein erstes Betätigungselement und ein mit dem ersten Betätigungselement eine Betätigungs-Druckfluidkammer begrenzendes zweites Betätigungselement, wobei durch Einleitung von Druckfluid in die Betätigungs-Druckfluidkammer das zweite Betätigungselement aus einer Grundpositionierung bezüglich des ersten Betätigungselements in einer Betätigungsrichtung entlang einer Bewegungsachse bewegbar ist,
• - ein vermittels einer Druckfluid-Abstützanordnung mit variablem Druckfluid-Abstützvolumen mit dem zweiten Betätigungselement zur gemeinsamen Bewegung gekoppeltes oder koppelbares Drehentkopplungslager.

According to the invention, this object is achieved by a pressurized fluid actuation arrangement for a friction clutch, comprising

• a first actuation element and a second actuation element delimiting an actuation pressure fluid chamber with the first actuation element, the second actuation element being movable from a basic position with respect to the first actuation element in an actuation direction along a movement axis by introducing pressure fluid into the actuation pressure fluid chamber,
• - A rotary decoupling bearing which is coupled or can be coupled to the second actuating element for joint movement by means of a pressurized fluid support arrangement with a variable pressurized fluid support volume.

By providing a pressure fluid support arrangement in the power transmission path between the second actuating element and the rotary decoupling bearing, it is possible, by changing the volume of the pressure fluid used for the support, to allow a relative movement between these two components, with which a wear-related change in the installation position of a force accumulator of a friction clutch, in particular in the The state of engagement of the same can be compensated. With a pressurized fluid actuation arrangement constructed in this way, due to a minimized dead volume of the pressurized fluid chamber, improved regulation and, in particular, improved dynamics when performing clutch actuation processes is achieved.

For a uniform loading of an energy store, it is proposed that the first actuating element is a cylinder, preferably a ring cylinder, and that the second actuating element is a piston, preferably a ring piston.

• - einen Abstützzylinder und einen mit dem Abstützzylinder eine Abstütz-Druckfluidkammer begrenzenden Abstützkolben,
• - ein Abstütz-Druckfluidausgleichsvolumen,
• - ein Abstütz-Druckfluidventil zwischen der Abstütz-Druckfluidkammer und dem Abstütz-Druckfluidausgleichsvolumen, wobei bei in der Grundpositionierung positioniertem zweitem Betätigungselement das Abstütz-Druckfluidventil in einer eine Verbindung zwischen der Abstütz-Druckfluidkammer und dem Abstütz-Druckfluidausgleichsvolumen herstellenden Offenstellung ist und bei Bewegung des zweiten Betätigungselement aus der Grundpositionierung in der Betätigungsrichtung in eine die Verbindung zwischen der Abstütz-Druckfluidkammer und dem Abstütz-Druckfluidausgleichsvolumen unterbrechenden Sperrstellung kommt.

The pressurized fluid support assembly may include:

• - a support cylinder and a support piston delimiting a support pressure fluid chamber with the support cylinder,
• - a support pressure fluid equalization volume,
• - A support pressure fluid valve between the support pressure fluid chamber and the support pressure fluid compensation volume, with the second actuating element positioned in the basic position, the support pressure fluid valve in an open position that establishes a connection between the support pressure fluid chamber and the support pressure fluid compensation volume and when the second actuating element is moved Actuating element comes from the basic position in the actuating direction into a blocking position which interrupts the connection between the support pressure fluid chamber and the support pressure fluid equalization volume.

For a defined support effect between the second actuating element and the rotary decoupling bearing, it is proposed that the support piston is coupled to the rotary decoupling bearing for joint movement in the direction of the movement axis, and that the support cylinder is displaceable by the second actuating element when the second actuating element is moved in the actuating direction, whereby a first pretensioning arrangement is assigned to the support cylinder for pretensioning the support cylinder with respect to the rotary decoupling bearing in a release direction substantially opposite to the actuation direction towards the second actuation element.

In order to be able to generate a relative movement between the latter and the second actuating element for the switching of the supporting pressure fluid valve, a release direction movement stop can be provided for the supporting cylinder, wherein when the supporting cylinder moves together with the second actuating element comes in the release direction of the support cylinder in a stop position in contact with the release direction movement stop before the second actuating element comes into the basic position.

For the establishment of a switching interaction between the supporting pressure fluid valve and the second actuating element, it is proposed that the supporting pressure fluid valve comprises a valve slide which is pretensioned in the direction of the open position of the supporting pressure fluid valve, whereby when the second actuating element is moved out of the basic position in the actuating direction when in the stop position positioned support cylinder, the second actuating element moves the valve slide in the direction of the blocking position of the support pressure fluid valve and / and when the support cylinder moves out of the stop position together with the first actuation element in the actuation direction, the support pressure fluid valve is in the blocking position. In particular, the valve slide can comprise an impact section acted upon by the second actuating element when moving from the basic position to move the valve slide.

The release direction movement stop for the support cylinder can be provided on the first actuating element, and the support pressure fluid equalization volume can be provided on the support cylinder.

For an even force transmission effect, it can be provided that the support cylinder is an annular cylinder and the support piston is an annular piston.

Furthermore, precise actuation of a friction clutch can be supported in that a supporting pressure fluid provided in the supporting pressure fluid chamber and / or the supporting pressure fluid compensation volume is a liquid, that is to say an essentially incompressible fluid.

For a compact design, it is proposed that, in the basic positioning, the second actuating element is axially supported on the first actuating element, that is to say rests against it. This also minimizes the need to operate with pressurized fluid, e.g. B. compressed air, dead volume to be filled in the pressure fluid chamber.

By means of a second preloading arrangement, the second actuating element can be preloaded with respect to the rotary decoupling bearing in the basic position towards the first actuating element and thus in a defined position.

The invention further relates to a clutch system comprising a friction clutch with an energy storage device which can be acted upon by a pressure fluid actuation arrangement according to the invention for carrying out clutch actuation processes.

• 1 eine Teil-Längsschnittansicht einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 2 eine Teil-Längsschnittansicht der Druckfluid-Betätigungsanordnung der 1 am Beginn eines Betätigungsvorgangs einer Reibungskupplung;
• 3 eine der 2 entsprechende Teil-Längsschnittansicht bei ausgerückter Reibungskupplung;
• 4 eine der 1 entsprechende Teil-Längsschnittansicht nach Durchführung einer Verschleißkompensation;
• 5 eine Teil-Längsschnittansicht einer alternativen Ausgestaltungsart einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 6 eine Teil-Längsschnittansicht einer weiteren alternativen Ausgestaltungsart einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 7 eine Teil-Längsschnittansicht einer weiteren alternativen Ausgestaltungsart einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 8 eine Detailansicht eines Endabschnitts eines Abstützzylinders einer Druckfluid-Betätigungsanordnung

The present invention is described in detail below with reference to the accompanying figures. It shows:

• 1 a partial longitudinal sectional view of a pressurized fluid actuator assembly for a friction clutch;
• 2 FIG. 3 is a partial longitudinal sectional view of the pressurized fluid actuator assembly of FIG 1 at the start of a friction clutch actuation process;
• 3 one of the 2 corresponding partial longitudinal sectional view with the friction clutch disengaged;
• 4th one of the 1 corresponding partial longitudinal sectional view after carrying out a wear compensation;
• 5 a partial longitudinal sectional view of an alternative embodiment of a pressure fluid actuation arrangement for a friction clutch;
• 6th a partial longitudinal sectional view of a further alternative embodiment of a pressure fluid actuating arrangement for a friction clutch;
• 7th a partial longitudinal sectional view of a further alternative embodiment of a pressure fluid actuating arrangement for a friction clutch;
• 8th a detailed view of an end portion of a support cylinder of a pressurized fluid actuation arrangement

The 1 and 2 each show a partial longitudinal sectional view of a pressure fluid actuation arrangement, also generally referred to as a releaser 10 for a friction clutch 12 . The friction clutch 12 is based on an energy store provided in this and designed, for example, as a diaphragm spring 14th shown.

The pressurized fluid actuator assembly 10 comprises a first actuating element providing a ring cylinder 16 , which with its basically ring-like structure an axis of movement A. surrounds like a ring. For example, the first actuating element 16 with one also an outer peripheral wall 20th providing bottom part 21st and one with the bottom part 21st connected and essentially also an inner peripheral wall 18th providing guide sleeve 23 be constructed. One essentially between the inner peripheral wall 18th and the outer peripheral wall 20th of the first actuating element 16 engaging second actuator 22nd represents the axis of motion A. ring-like surrounding ring cylinder ready. Via a plurality of sealing / guiding elements 24 is the second actuator 22nd with respect to the inner peripheral wall 18th and the outer peripheral wall 20th of the first actuating element 16 fluid-tight and with respect to this in the direction of the axis of movement A. movably guided.

Between the first actuating element 16 and the second actuator 22nd is one of the various sealing / guiding elements 24 fluid-tight closed actuating pressure fluid chamber 26th educated. The actuating pressure fluid chamber can be entered via a connection (not shown) 26th a pressurized fluid, for example compressed air, can be introduced to by building up a fluid pressure in the actuating pressurized fluid chamber 26th one the second actuating element 22nd in one operating direction B. with respect to the first actuating element 16 build up applying or moving force. When the second actuating element is moved 22nd in the direction of movement B. acts on this via a second actuating element 22nd for example held rotary decoupling bearing 28 the radially inner area, for example, spring tongues of the energy storage device that extend radially inward 14th in order to perform a disengagement in the direction of movement B. to move or pivot and thereby the action of the energy storage device 14th on a pressure plate of the friction clutch 12 to reduce or cancel.

Between the rotary decoupling bearing 28 and the second actuator 22nd is a ring-like design and radially inside on the second actuating element in the direction of the axis of movement A. movably guided transmission element 30th intended. The transmission element 30th supports the rotary decoupling bearing 28 in the axial direction or carries this and is through one on the transmission element 30th and on the other hand, a biasing spring supported on the second actuating element 32 in the direction of the second actuating element 22nd axially preloaded away.

By means of a general with 34 designated pressure fluid support arrangement can be an at least axially fixed coupling between the second actuating element 22nd and the rotary decoupling bearing 28 bearing or coupled with this for common axial movement transmission element 30th getting produced. The pressurized fluid support assembly 34 includes a support cylinder 36 , which is basically in the direction of the axis of movement A. is displaceable and by a first biasing arrangement 38 in one of the operating directions B. substantially opposite release direction F. is applied. The first biasing arrangement 38 can for example be the axis of movement A. surrounding arranged preload spring 40 include, which can be designed for example as helical compression springs. The preload spring 40 is based on the transmission element 30th on the one hand and on the support cylinder 36 on the other hand, and thus presses it in the release direction F. on the second actuator 22nd to.

The outer peripheral wall 20th of the first actuating element 16 provides a release direction movement stop with its axial end region 42 ready to which the support cylinder 36 with a radially outwardly engaging stop section 44 when moving in the release direction F. can come to rest, so that when a stop position is reached, the support cylinder 36 no further in the release direction F. can move. The second actuator 22nd however, is in the release direction F. going beyond this stop positioning of the support cylinder 36 movable into the basic position, in which there is, for example, axially on the first actuating element 16 pending. By essentially having a second biasing arrangement 46 providing preload spring 32 is the second actuator 22nd biased into this basic position. In the basic position of the second actuating element 22nd is the support cylinder held in the stop position 36 not axially on the second actuating element 22nd supported so that when moving out of the home position in the actuation direction B. the second actuator 22nd first passes through a small dead stroke in which it the support cylinder 36 does not drive axially. Only when the second actuator 22nd with continued movement in the actuation direction B. the support cylinder initially held in the stop position 36 reaches or comes into contact with this, takes the second actuating element 22nd the support cylinder 36 on its continued movement in the actuation direction B. With.

The pressurized fluid support assembly 34 further comprises a support piston 48 . This too, like the support cylinder 36 , a basically ring-like structure and engages with its ring-like structure in the ring-like structure of the support cylinder 36 one. The support cylinder 36 and the support piston 48 together limit the axis of movement A. ring-like surrounding support pressure fluid chamber 50 which via a support pressure fluid valve generally designated 52 52 in and out of connection with a support pressure fluid equalization volume 54 can be brought. On the support piston 48 is a ring-like sealing element 56 worn, which provides a fluid-tight closure of the support Pressurized fluid chamber 50 guaranteed. The support piston 48 itself is as part of the transmission element 30th formed or is fixed thereon and thus with this for common movement in the direction of the movement axis A. coupled.

The support pressure fluid valve 52 includes one by a bias spring 58 in the direction of an open position of the support pressure fluid valve 52 preloaded valve spool 60 . This is in a valve chamber 62 in the direction of the axis of movement A. slidably received and has one in its in 1 shown and the open position of the support pressure fluid valve 52 corresponding positioning axially over the support cylinder 36 on the second actuator 22nd to protruding loading section 64 on.

With the second actuating element positioned in the home position 22nd and support cylinder positioned in the stop position 36 can the valve slide 60 axially on the second actuating element 20th support so that over to the valve chamber 62 open openings and a circumferential recess on the valve slide 60 a connection between the support pressure fluid chamber 52 and the support pressure fluid equalization volume 54 is made. The valve slide is axially on both sides of the circumferential recess 60 by, for example, O-ring-like sealing elements tightly closed with respect to the valve chamber 62 guided.

Moves the second actuator 22nd from its basic position in the direction of actuation B. onto the support cylinder initially held in the stop position 36 to move the second actuating element 22nd the valve slide 60 against the biasing action of the biasing spring 58 into the valve chamber 62 into it, so that the circumferential recess on the valve slide 60 with respect to the valve chamber 62 open openings is moved and these openings by a blocking portion of the valve slide 60 covered or closed. In this blocking position of the support pressure fluid valve 52 is the connection between the support pressure fluid chamber 50 and the support pressure fluid equalization volume 54 interrupted so that the support pressure fluid chamber 50 completed and the pressure fluid present therein in this state is enclosed in a fluid-tight manner. This pressure fluid is preferably a liquid, such as oil or the like, so that due to the incompressibility of the support pressure fluid there is an axially fixed coupling between the support cylinder 36 and thus also the second actuating element 22nd on the one hand and the support piston 48 and thus the transmission element 30th or the rotary decoupling bearing 28 on the other hand exists.

That on the support piston 36 provided support pressure fluid equalization volume 54 is in a differential housing 66 educated. This can be the support cylinder 36 be fixed radially on the outside surrounding it and thus a ring-like structure of the support pressure fluid compensation volume 54 provide. This is through an axially movable sealing element 68 completed, which is under the bias of a bias spring 70 , for example wave spring or the like, is.

In the clutch actuation mode, an actuating force is exerted on the energy storage device 14th Pressurized fluid into the actuation pressurized fluid chamber 26th initiated. By the one in the actuation pressure fluid chamber 26th The built-up fluid pressure becomes the second actuating element 22nd in one operating direction B. applied force generated, which a movement of the second actuating element 22nd in the direction of actuation B. triggers. The second actuating element moves first 22nd without the support cylinder 36 until the in 2 shown state of the valve slide 60 into the valve chamber 62 is inserted and thus the support pressure fluid chamber 50 is completed. The second actuating element is in this state 22nd axially on the support cylinder 36 and then takes it out of its stop position in the actuating direction B. With. Due to the closed support pressure fluid chamber 50 and the incompressible support pressure fluid is also an axially fixed coupling between the second actuating element in this state 22nd and the rotary decoupling bearing 28 so that this is also shifted axially and the energy store 14th radially inwards to disengage the clutch 12 applied.

To re-engage the friction clutch 12 becomes the pressure in the actuating pressurized fluid chamber 26th lowered or released, so that in particular under the force of the energy accumulator 14th the rotary decoupling bearing 28 and with this the transmission element 30th and the second actuator 22nd in one of the operating directions B. opposite release direction F. be moved. This movement can continue, for example, until the second actuating element 22nd again on the first actuator 16 pending. The support cylinder is already previously in the course of this movement 36 through the release direction movement stop 42 held in its stop position. The connection between the support pressure fluid chamber is in this state 50 and the support pressure fluid equalization volume 54 restored.

Occurs in the friction clutch 12 Wear, this generally has the consequence that when coupling processes are carried out, that is, when the second actuating element is moved 22nd in the release direction F. , the energy store 14th themselves in its radially inner area moved further axially or relaxed than in a state in which there is no wear or less wear in the friction clutch. This means that the energy storage mechanism is activated during the transition to the engaged state 14th then when the support cylinder through the release direction movement stop 42 is held axially and by continued movement of the second actuator 22nd in its home position the support pressure fluid valve 52 comes into its open position, the energy storage 14th via the transmission element 30th the support piston 48 further into the support cylinder 36 can move into it, for example into the in 4th shown condition. Since the support pressure fluid valve 52 is in its open position, this support pressure fluid from the support pressure fluid chamber 50 into the support pressure fluid equalization volume 54 be displaced. This takes place while shifting the sealing element 68 and compression of the bias spring 70 Support pressure fluid on.

In its basic positioning, in particular, also by the biasing action of the biasing spring 32 against the first actuating element 16 pressed second actuating element 22nd can the energy store 14th against the biasing action of the biasing spring 32 thus get into a more relaxed position, which is the same as in the friction clutch 12 corresponds to the wear that has occurred. During the next disengagement process to be carried out, the second actuating element first moves 22nd again with a small dead stroke until it is back on the support cylinder 36 comes to rest or until the support pressure fluid valve 52 is back in its locked position and then continues into the support cylinder 36 in displaced support piston 48 and thus a smaller volume of the support pressure fluid chamber 50 again an axially fixed coupling between the second actuating element 22nd and the transmission element 30th via the pressurized fluid support assembly 34 is made. In this way, compensation of the wear that has occurred in a friction clutch can be carried out continuously and with each actuation process.

The 5 Figure 3 shows an alternative embodiment of a pressurized fluid actuator assembly 10 , which is essentially in the design of the support pressure fluid valve 52 differs from the embodiment described above. In the following, only the structural differences that exist in relation to the previous embodiment will be discussed, otherwise reference is made to the above explanations.

The valve slide 60 of the support pressure fluid valve 52 interspersed with a preloaded preload spring 58 stationary valve tappet 72 a valve opening 74 . A valve sealing element 76 surrounds the valve stem 72 and comes when the loading section is applied 64 by the second actuating element 22nd in attachment to one of the opening 74 deploying wall 78 . The valve sealing element closes 76 the opening 74 from and thus interrupts a flow path from the support pressure fluid chamber 50 over an opening 80 along the outside of the valve spool 60 , through the opening 74 to a support pressure fluid equalization volume 54 leading channel 82 leads. When the support pressure fluid is displaced from the support pressure fluid chamber 50 due to the occurrence of wear in the friction clutch 12 shifts this into the support pressure fluid equalization volume 54 displaced support pressure fluid the sealing element 68 so that this while increasing the support pressure fluid equalization volume 54 Air from a chamber open to the environment 84 repressed.

The particular advantage of this configuration is that through the valve sealing element 76 a reliable, fluid-tight closure of the support pressure fluid chamber 50 to the support pressure fluid equalization volume 54 can be guaranteed.

One in the design of the support pressure fluid equalization volume 54 The configuration that differs from the previous configurations is shown in 6th shown. This, for example, again with a ring-like structure with respect to the axis of movement A. trained support pressure fluid equalization volume 54 is in the differential housing 66 by one by two sealing element 85 , 86 fluid-tight moveable guided piston 87 completed. The piston 87 is under the preload of several preload springs 88 , so that when the support pressure fluid is displaced from the support pressure fluid chamber 50 into the support pressure fluid equalization volume 54 The piston 87 against the pre-tensioning effect of the pre-tensioning springs 88 can be moved.

Another modified embodiment of a pressurized fluid actuation arrangement 10 is in 7th shown. In this embodiment, the radial staggering of the support pressure fluid chamber 50 and support pressure fluid equalization volume 54 vice versa. This is radially inside the support pressure fluid chamber 50 and in particular also the support pressure fluid valve 52 arranged. The support pressure fluid valve 52 has a similar structure as in 5 . One valve tappet 72 surrounding arranged valve sealing element 76 closes when the loading section is applied 64 by the second actuating element 22nd the opening 74 and interrupts a connection to the channel 82 or the support pressure fluid equalization volume 54 . This in 7th Support pressure fluid compensation volume not shown in detail 54 can be constructed as described above, for example, with an axially displaceable sealing element.

In this embodiment, it is the support cylinder 36 in the direction of the second actuating element 22nd Pre-tensioning spring to be preloaded 40 radially outward with respect to the preload spring 32 , in particular also radially outside of the support piston 48 arranged. Furthermore, in 7th to see that in this embodiment, the support piston 48 from the transmission element 30th formed separately, but is firmly connected to this, for example, by material connection or by screwing or the like.

The 8th shows a variation in the structure of the support piston 48 . The 8th a separately formed end portion 90 of the support piston 48 , on which the support piston 48 regarding the support cylinder 36 fluid-tight movable sealing element 92 and a support element supporting this 94 is provided. Another sealing element 96 and a support element associated therewith 98 are on the support cylinder 36 carried.

In the final section 90 is a in the example shown by a screw 100 constructed closing element, fluid-tight closed channel 102 intended. Via this channel 102 can the support pressure fluid chamber 50 vented when assembling the system. After filling the support pressure fluid chamber 50 with the support pressure fluid or the insertion of the end section 90 in the support cylinder 36 can possibly remaining air through the duct 102 be displaced. After inserting the closing element and thus closing the channel 102 can be the end section 90 then with the example on the transmission element 30th integrally provided part of the support piston 48 be firmly connected.

List of reference symbols

10

Pressurized fluid actuator assembly

12th

Friction clutch

14th

Energy storage

16

first actuator

18th

Inner circumference wall

20th

Outer circumference wall

21st

Bottom part

22nd

second actuator

23

Guide sleeve

24

Sealing / guiding element

26th

Actuating pressurized fluid chamber

28

Rotary decoupling bearings

30th

Transmission element

32

Preload spring

34

Pressurized fluid support assembly

36

Support cylinder

38

first biasing arrangement

40

Preload spring

42

Release direction movement stop

44

Stop section

46

second biasing arrangement

48

Support piston

50

Support pressure fluid chamber

52

Support pressure fluid valve

54

Support pressure fluid equalization volume

56

Sealing element

58

Preload spring

60

Valve spool

62

Valve chamber

64

Loading section

66

Differential housing

68

Sealing element

70

Preload spring

72

Valve lifters

74

opening

76

Valve sealing element

78

wall

80

opening

82

channel

84

chamber

85

Sealing element

86

Sealing element

87

piston

88

Preload spring

90

End section

92

Sealing element

94

Support element

96

Sealing element

98

Support element

100

screw

102

channel

A.

Axis of motion

B.

Operating direction

F.

Release direction

Claims (14)

A pressurized fluid actuator assembly for a friction clutch, comprising - A first actuating element (16) and a second actuating element (22) delimiting an actuating pressure fluid chamber (26) with the first actuating element (16), the second actuating element (26) being activated by introducing pressure fluid into the actuating pressure fluid chamber (26) a basic positioning is movable with respect to the first actuating element in an actuating direction (B) along a movement axis (A), - A rotary decoupling bearing (28) which is coupled or can be coupled to the second actuating element (22) for common movement by means of a pressurized fluid support arrangement (34) with a variable pressurized fluid support volume. Pressurized fluid actuator assembly according to Claim 1 , characterized in that the first actuating element (16) is a cylinder, preferably an annular cylinder, and that the second actuating element (22) is a piston, preferably an annular piston. Pressurized fluid actuator assembly according to Claim 1 or 2 , characterized in that the pressure fluid support arrangement (34) comprises: - a support cylinder (36) and a support piston (48) delimiting a support pressure fluid chamber (50) with the support cylinder (36), - a support pressure fluid equalization volume (54), - A support pressure fluid valve (52) between the support pressure fluid chamber (50) and the support pressure fluid compensation volume (54), with the support pressure fluid valve (52) in a connection between the support when the second actuating element (22) is positioned in the basic position -Pressure fluid chamber (50) and the support pressure fluid compensation volume (54) producing the open position and when the second actuating element (22) is moved from the basic position in the actuation direction into a connection between the support pressure fluid chamber (50) and the support pressure fluid compensation volume (54 ) interrupting locked position comes. Pressurized fluid actuator assembly according to Claim 3 , characterized in that the support piston (48) is coupled to the rotary decoupling bearing (28) for joint movement in the direction of the movement axis (B), and that the support cylinder (36) when the second actuating element (22) is moved in the actuating direction by the second The actuating element (22) is displaceable, with the support cylinder (36) being assigned a first preloading arrangement (38) for preloading the support cylinder (36) with respect to the rotary decoupling bearing (28) in a release direction (F) which is essentially opposite to the actuating direction (B) second actuating element (22) to. Pressurized fluid actuator assembly according to Claim 4 , characterized in that a release direction movement stop (42) is provided for the support cylinder (36), wherein when the support cylinder (36) moves together with the second actuating element (22) in the release direction (F) of the support cylinder (36) in one Stop positioning comes into contact with the release direction movement stop (42) before the second actuating element (22) comes into the basic positioning. Pressurized fluid actuator assembly according to Claim 5 , characterized in that the support pressure fluid valve (52) comprises a valve slide (60) preloaded in the direction of the open position of the support pressure fluid valve (52), wherein when the second actuating element (22) is moved out of the basic position in the actuating direction (B) at in the support cylinder (36) positioned in the stop positioning the second actuating element (22) moves the valve slide (60) in the direction of the blocking state of the support pressure fluid valve (22) and / or when the support cylinder (36) moves out of the stop position together with the second actuating element (22) in the actuation direction (B), the support pressure fluid valve (52) is in the blocking position. Pressurized fluid actuator assembly according to Claim 6 , characterized in that the valve slide (60) comprises an impingement section (64) acted upon by the second actuating element (22) when moving from the basic position to move the valve slide (60). Pressurized fluid actuator assembly according to Claims 5 to 7th , characterized in that the release direction movement stop (42) is provided on the first actuating element (16). Pressurized fluid actuation arrangement according to one of the Claims 3 to 8th , characterized in that the support pressure fluid equalization volume (54) is provided on the support cylinder (36). Pressurized fluid actuation arrangement according to one of the Claims 3 to 9 , characterized in that the support cylinder (36) is an annular cylinder and the support piston is an annular piston (48). Pressurized fluid actuation arrangement according to one of the Claims 3 to 10 , characterized in that a support pressure fluid provided in the support pressure fluid chamber (50) and / or the support pressure fluid compensation volume (54) is a liquid. Pressurized fluid actuation arrangement according to one of the preceding claims, characterized in that in the basic position the second actuation element (22) is axially supported on the first actuation element (16). Pressure fluid actuation arrangement according to one of the preceding claims, characterized in that a second preloading arrangement (46) is provided for preloading the second actuating element (22) with respect to the rotary decoupling bearing (28) in the basic position towards the first actuating element (16). A clutch system comprising a friction clutch (12) with an energy store (14) which can be acted upon by a pressure fluid actuation arrangement (10) according to one of the preceding claims for carrying out clutch actuation processes.

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